Backgrounders

The students who appear in the backgrounds, classrooms, and hallways of Monster High are as dear to fans as the main characters. Currently, two backgrounders have even ascended to fullfledged charactership. The first is Scarah Screams, who will be made into a doll in late 2011 to 2012, and the second is Don of the Dead, who has mid-Volume 2 become a friend of Ghoulia and Slow-Moe. Another backgrounder, the three-eyed girl, has been incorporated in the Create-a-Monster packs.

Note that this page only contains info on background characters that are students to Monster High or reused models of Monster High students. For information on other background characters, including the former Crescent Moon High and Belfry Prep students, please see other backgrounders.

Volume 1 backgrounders
The Volume 1 backgrounders are the backgrounders who originated in webisodes that are part of Volume 1, as well as the backgrounders that originated in younger webisodes but that possess a design based on a Volume 1 backgrounder. Volume 1 backgrounders are, obviously, the oldest of the backgrounders, filling up the halls of Monster High since the very start. They are fairly easily recognizable for their conservative appearance. That is, there is roughly one body build for boys and one for girls, more than a few backgrounders share faces and headshapes and most backgrounders are not recognizable as a specific monster. What is particularly odd about this is that there áre some very creative Volume 1 backgrounder designs, but nearly all of those appear only once.

With the transition to Volume 2 (and further), many Volume 1 backgrounders have been dropped from the series, as new backgrounders with better designs and additional characters have been introduced that make for more appealing appearances in the Monster High halls.

Fear Squad poster girl
The Fear Squad poster girl is a monster exclusively seen on the announcement posters for Fear Squad auditions in "New Ghoul @ School" and "Why We Fright". Since she wears the Monster High uniform but is never seen on Cleo's squad, it is likely she was a fearleader for a previous squad, possibly when Nefera was the captain.



Animal girl
The animal girl is an often seen face around the Monster High halls. Her monster type is unknown, though she appears to be a werebeast; many fans identify her as a werecat, but truthfully, she lacks any worthwhile hint that would be the case. There are two versions of animal girl in existence.


 * The pink animal girl is established as a member of the Fear Squad in "New Ghoul @ School" and "Scream Building". She quit the team in the latter webisode due to Cleo's demanding attitude. In "Idol Threat", she was hypnotized by Cleo to step aside. Her character model has been reused twice for a different character, once as a fearleader for another school in "Monster Mashionals Part 2" and once as an adult photographer in "Neferamore".
 * The animal girl appears in "New Ghoul @ School", "Jaundice Brothers", "Talon Show", "Party Planners", "Blue Lagoona", "Bad Scare Day", "Photo Finish", "Freedom Fight", "Shock and Awesome", "Mad Science Fair", "The Good, the Bad and the Fabulous", "Rumor Run Wild", "Horrorscope", "Idol Threat", "Hatch Me If You Can", "A Scare of a Dare", "Scream Building", "Why We Fright", "Fear-A-Mid Power", "Beast Friends", "Varsity Boos", "Falling Spirits", "Fatal Error", "Screech to the Beach", "Don't Cheer the Reaper", "Road to Monster Mashionals", "Queen of the Scammed", "Frightday the 13th", "HooDoo You Like?", "Fear Pressure", "Fear the Book", "Miss Infearmation", "Hyde and Shriek", "Daydream of the Dead", "Nefera Again", "Abominable Impression", "Frost Friends", "Hyde Your Heart", "Ghostly Gossip", "Hiss-teria", "Phantom of the Opry", "The Bermuda Love Triangle", "Here Comes Treble", "Monster Mashionals Part 2", "Fright On!", "Kind: The Shockumentary", "Super Fan", "Uncommon Cold", "Ghosts with Dirty Faces" and "Hickmayleeun".
 * The blue animal girl showed up first mid-Volume 2.
 * The blue animal girl appears in "Miss Infearmation", "Fright On!" and "Super Fan".

Catgirl
The catgirl is one of the rarer backgrounders, appearing only 'four' times in the webisodes. She tries to make the Fear Squad in both "New Ghoul @ School" and "Fear Squad", but doesn't have the confidence or skill to accomplish that feat. A picture of her during Fear Squad tryouts was inserted in the fearbook, as seen in "Fear the Book". However, she shows up as a fearleader in the online game Pom-Pom Panic, while her model was used in "Monster Mashionals Part 1" for a fearleader from a competing school.

Cheek-scar girl
The cheek-scar girl was a member of the Fear Squad in "New Ghoul @ School", but supposedly quit the team shortly thereafter. She auditioned for a part in Hamlet: The Musical, but didn't get it. This didn't stop her from cheering on the people who got through auditions and gave a quality performance in "Clawditions". This is also the only moment she received a line of dialogue. In "Varsity Boos", she hosted one of the funfair games. The animation model of cheek-scar girl was also used for a fearleader from a competing school in "Monster Mashionals Part 1".
 * The cheek-scar girl appears in "New Ghoul @ School", "Jaundice Brothers", "Copy Canine", "The Hot Boy", "Photo Finish", "A Bad Zituation", "Clawditions", "Freedom Fight", "Freakout Firday", "Shock and Awesome", "Mad Science Fair", "Rumor Run Wild", "Horrorscope", "Idol Threat", "Hatch Me If You Can", "Why We Fright", "Fear-A-Mid Power", "Beast Friends", "Varsity Boos", "Fatal Error", "Screech to the Beach", "Don't Cheer the Reaper", "Road to Monster Mashionals", "Frightday the 13th", "Fear Pressure", "Fear the Book", "Miss Infearmation", "Hyde and Shriek", "Daydream of the Dead", "Nefera Again", "Frost Friends", "Hiss-teria", "The Bermuda Love Triangle", "Here Comes Treble", "Neferamore", "Monster Mashionals Part 2", "Fright On!", "Kind: The Shockumentary", "Zom-Beach Party" and "Uncommon Cold".

Glasses girl
The glasses girl is generally thought to be an elf due to her long, pointy ears. There are three versions of her.
 * The blue glasses girl was a member of the Fear Squad in "New Ghoul @ School", but supposedly quit the team shortly thereafter. She had one line of dialogue in "Clawditions", which reveals she's a fan of Shakespeare. In "Party Planners", she attended Frankie's and Draculaura's birthday party and in "Idol Threat", she was hypnotized by Cleo to step aside. She was shocked by Frankie in "Uncommon Cold" when the latter got sick. The glasses girl's model was used in "Monster Mashionals Part 1" for a fearleader from a competing school.
 * The glasses girl appears in "New Ghoul @ School", "Jaundice Brothers", "Substitute Creature", "Party Planners", "Bad Scare Day", "Photo Finish", "Clawditions", "Freedom Fight", "Shock and Awesome", "Mad Science Fair", "Rumor Run Wild", "Horrorscope", "Idol Threat", "Hatch Me If You Can", "Date of the Dead", "Why We Fright", "Fear-A-Mid Power", "Beast Friends", "Varsity Boos", "Falling Spirits", "Fatal Error", "Screech to the Beach", "Don't Cheer the Reaper", "Road to Monster Mashionals", "Queen of the Scammed", "HooDoo You Like?", "Fear Pressure", "Fear the Book", "Desperate Hours", "Miss Infearmation", "Hyde and Shriek", "Daydream of the Dead", "Back-To-Ghoul", "Abominable Impression", "Frost Friends", "Hyde Your Heart", "Ghostly Gossip", "The Bermuda Love Triangle", "Here Comes Treble", "Dueling Personality", "Rising From the Dead", "Monster Mashionals Part 2", "Fright On!", "Kind: The Shockumentary", "Fashion Emergency", "Super Fan", "Uncommon Cold" and "Hickmayleeun".
 * The pink glasses girl only appeared in "Date of the Dead" and could very well be an animation 'error'. She was drawn opposite of the blue glasses girl, making it possible she was colored differently so that no other model needed to be drawn yet the same backgrounder would not appear in the same shot twice. Alternatively, her colors are similar to the cheek-scar girl, so perhaps she was scheduled to be drawn but her animation model got mixed with the glasses' girls. Either way, with no clear argument for it, she is to be regarded as a separate backgrounder.
 * The peach glasses girl debuted mid-Volume 2.
 * The peach glasses girl appears in "Miss Infearmation", "Fright On!" and "Super Fan".

Three-eyed girl
While remaining a backgrounder, the three-eyed girl is a step above her colleagues in that she has received a toy: her appearance is among the first three Create-a-Monster accessory packs. In "New Ghoul @ School", the three-eyed girl tried to get a spot on the Fear Squad, but fled the auditions after seeing how good the older members were. Also in "New Ghoul @ School", the three-eyed girl was the most expressive in responding to Lou Zarr's boredom-inducing teaching methods, as she acted as if she was dying. She danced with the pink cyclops boy in "Fright On!", though he was earlier seen with someone else. Her model was used in "Monster Mashionals Part 1" for a fearleader from a competing school.
 * The three-eyed girl appears in "New Ghoul @ School", "Jaundice Brothers", "Talon Show", "Party Planners", "Blue Lagoona", "Copy Canine", "Bad Scare Day", "Clawditions", "Totally Busted", "Rumor Run Wild", "Horrorscope", "Idol Threat", "Hatch Me If You Can", "Fear-A-Mid Power", "Varsity Boos", "Falling Spirits", "Fatal Error", "Screech to the Beach", "Don't Cheer the Reaper", "Road to Monster Mashionals", "Frightday the 13th", "HooDoo You Like?", "Fear Pressure", "Fear the Book", "Desperate Hours", "Miss Infearmation", "Hyde and Shriek", "Daydream of the Dead", "Frost Friends", "Ghostly Gossip", "Hiss-teria", "The Bermuda Love Triangle", "Monster Mashionals Part 2", "Fright On!", "Kind: The Shockumentary", "Super Fan", "Zom-Beach Party" and "Uncommon Cold".

Ponytail girl
The ponytail girl is among the regular female Volume 1 backgrounders. She is also among the few Monster High students that could pass for a regular human, though her ears reveal she is still a monster of sorts. The ponytail girl tries to get on the Fear Squad in "Fear Squad", but doesn't make it. A picture of her during Fear Squad tryouts was inserted in the fearbook, as seen in "Fear the Book". She also shows up in the online game Pom-Pom Panic. A particular oddity of the ponytail girl is that, despite that she has a unique and complete design, her presence in the webisodes has greatly diminished since the start of Volume 2. It is possible her human looks are the reason behind this.
 * The ponytail girl appears in "New Ghoul @ School", "Talon Show", "Fear Squad", "Substitute Creature", "Party Planners", "Blue Lagoona", "The Hot Boy", "Photo Finish", "A Bad Zituation", "Clawditions", "Freedom Fight", "Totally Busted", "Mad Science Fair", "The Good, the Bad and the Fabulous", "Rumor Run Wild", "Horrorscope", "Idol Threat", "Date of the Dead", "Fear-A-Mid Power", "Varsity Boos", "Falling Spirits", "Queen of the Scammed", "HooDoo You Like?", "Fear the Book", "Frost Friends" and "Fright On!".

Cyclops girl
The cyclops girl is one of the core female Volume 1 backgrounders, and one of the few whose monster type is obvious. She comes in two variations.


 * As confirmed in "New Ghoul @ School" and "Scream Building", the green cyclops girl was a member of the Fear Squad before the team quit in its entirety to one-up its captain Cleo. She is one of the few backgrounders to have a line of dialogue, in "Fear the Book", which revealed that she doesn't speak Zombie. In "Rumor Run Wild", the poster for the Scream Queen elections featured her image, but it's unknown why her. She romantically shared ice cream with the pink cyclops boy in "Fright On!", but he was later seen with someone else. In "Party Planners", the green cyclops girl attended Draculaura's and Frankie's birthday party, and in "Idol Threat", Cleo hypnotized her to step aside. The green cyclops girl occasionally is animated with part of her hair missing, giving the impression she is bald if not for the partial bangs and pigtail showing from behind her head.
 * The green cyclops girl appears in "New Ghoul @ School", "Talon Show", "Substitute Creature", "Party Planners", "Blue Lagoona", "Copy Canine", "The Hot Boy", "Photo Finish", "A Bad Zituation", "Freedom Fight", "Rumor Run Wild", "Idol Threat", "Hatch Me If You Can", "Date of the Dead", "Scream Building", "Why We Fright", "Fear-A-Mid Power", "Varsity Boos", "Gloomsday", "Falling Spirits", "Fatal Error", "Screech to the Beach", "Don't Cheer the Reaper", "Road to Monster Mashionals", "Queen of the Scammed", "Frightday the 13th", "HooDoo You Like?", "Fear Pressure", "Fear the Book", "Desperate Hours", "Miss Infearmation", "Hyde and Shriek", "Daydream of the Dead", "Nefera Again", "Back-To-Ghoul", "Abominable Impression", "Frost Friends", "Hyde Your Heart", "Ghostly Gossip", "Phantom of the Opry", "The Bermuda Love Triangle", "Here Comes Treble", "Dueling Personality", "Monster Mashionals Part 2", "Fright On!", "Kind: The Shockumentary", "Uncommon Cold" and "Hickmayleeun".
 * The purple cyclops girl appears mid-Volume 2.
 * The purple cyclops girl appears in "Miss Infearmation", "Fright On!" and "Super Fan".

Stitched-up mouth girl
The stitched-up mouth girl wears a pink cap that is often animated behind her head, leaving only the visor visible. She danced with the basic dark circles boy in "Fright On!". Her model was used in "Monster Mashionals Part 1" for a fearleader from a competing school.
 * The stitched-up mouth girl appears in "New Ghoul @ School", "Jaundice Brothers", "Talon Show", "Party Planners", "Blue Lagoona", "Bad Scare Day", "A Bad Zituation", "Clawditions", "Mad Science Fair", "Horrorscope", "Idol Threat", "Hatch Me If You Can", "Fear-A-Mid Power", "Varsity Boos", "Fatal Error", "Screech to the Beach", "Fear Pressure", "Fear the Book", "Hyde and Shriek", "Daydream of the Dead", "The Bermuda Love Triangle", "Here Comes Treble", "Fright On!", "Kind: The Shockumentary".

Punk girl
The punk girl is one of the rarer backgrounders, appearing only 'four' times in the webisodes. She tries to make the Fear Squad in both "New Ghoul @ School" and "Fear Squad", but doesn't have the confidence or skill to accomplish that feat. A picture of her during Fear Squad tryouts was inserted in the fearbook, as seen in "Fear the Book". However, she shows up as a fearleader in the online game Pom-Pom Panic, while her model was used in "Monster Mashionals Part 1" for a fearleader from a competing school.

Short-haired green girl
The short-haired green girl's face appears to be modeled after Draculaura's, sharing the same eyes, nose, lip and overall shape. She is one of the rarer backgrounders, appearing only 'twice' in the webisodes. She tries to make the Fear Squad in "New Ghoul @ School", but is intimidated out of that wish by the older Fear Squad's members' skills. Her model was used in "Monster Mashionals Part 1" for a fearleader from a competing school.

Blue girl with yellow eyes
The blue girl with yellow eyes is one of the rarer backgrounders, appearing only 'four' times in the webisodes. She tries to make the Fear Squad in both "New Ghoul @ School" and "Fear Squad", but doesn't have the confidence or skill to accomplish that feat. A picture of her during Fear Squad tryouts was inserted in the fearbook, as seen in "Fear the Book". She also shows up in the online game Pom-Pom Panic, while her model was used in "Monster Mashionals Part 1" for a fearleader from a competing school.

Hooded girl
The hooded girl walks around at monster High. Her model was used for a fearleader from a competing school in "Monster Mashionals Part 1".
 * The hooded girl appears in "Jaundice Brothers", "Talon Show", "Substitute Creature", "Party Planners", "Copy Canine", "Mad Science Fair", "Rumor Run Wild", "Horrorscope", "Idol Threat", "Hatch Me If You Can", "Date of the Dead", "Why We Fright", "Fear-A-Mid Power", "Varsity Boos", "Fatal Error", "Screech to the Beach", "Road to Monster Mashionals", "Queen of the Scammed", "Fear the Book", "Miss Infearmation", "Hyde and Shriek", "Daydream of the Dead", "Nefera Again", "Back-To-Ghoul", "Frost Friends", "Hiss-teria", "The Bermuda Love Triangle", "Here Comes Treble", "Monster Mashionals Part 2", "Fright On!", "Kind: The Shockumentary" and "Super Fan".

Scarah Screams
Scarah Screams began her existence as a main backgrounder, who was most notable for being on the Fear Squad prior to the en masse desertion from Cleo's demanding attitude in "Scream Building". At San Diego Comic-Con 2011, Mattel surprised the fans by putting forth 'sixties chick' as an actual character, Scarah Screams, daughter of the Banshee, and allowing fans to vote for her if they wanted to see her made into a doll. She won the vote and is likely to have her doll released in 2012. However, despite that Scarah won the vote mid-Volume 2, she remained a backgrounder throughout Volume 2, receiving a one time duplicate in "Fear-A-Mid Power" and having her model reused for a fearleader from a competing school in "Monster Mashionals Part 1".

Catboy
Catboy is Monster High's quintessential backgrounder. There exist a total of seven catboy variations that are almost assuredly all different characters and show up whenever one would least expect it.


 * The first and primary catboy has a pink skin and his hair combed backwards. He is one of the three catboys originating in Volume 1 and throughout that volume one of the most recognizable backgrounders. Some of his noteworthy appearances are in "Clawditions", where he auditoned for a role in the musical version of Hamlet, but didn't get the part, and in "Idol Threat", where Cleo at one point controlled him. He became a member of the casketball team sometime prior to Volume 2 and played a friendly match with his teammates in the Monster High hallways in "Beast Friends". In "Queen of the Scammed", he wore a life boa as part of the new fashion trend, but it attempted to strangle him. He's a generous boy too, since in "Rising From the Dead", he donated to the out-of-luck Fear Squad. His character model has been reused twice for a different character, once as a member of another school in "Fear-A-Mid Power" and once as an adult photographer in "Neferamore".
 * Basic catboy appears in "New Ghoul @ School", "Talon Show", "Clawditions", "Freakout Friday", "Mad Science Fair", "The Good, the Bad and the Fabulous", "Rumor Run Wild", "Fur Will Fly", "Horrorscope", "Idol Threat", "Hatch Me If You Can", "Date of the Dead", "Why We Fright", "Fear-A-Mid Power", "Beast Friends", "Varsity Boos", "Gloomsday", "Fatal Error", "Screech to the Beach", "Don't Cheer the Reaper", "Road to Monster Mashionals", "Queen of the Scammed", "Frightday the 13th", "HooDoo You Like?", "Fear Pressure", "Fear the Book", "Miss Infearmation", "Hyde and Shriek", "Daydream of the Dead", "Abominable Impression", "Frost Friends", "Ghostly Gossip", "Hiss-teria", "Phantom of the Opry", "The Bermuda Love Triangle", "Here Comes Treble", "Rising From the Dead", "Monster Mashionals Part 2", "Fright On!", "Kind: The Shockumentary", "Super Fan", "Uncommon Cold", "Ghosts with Dirty Faces" and "Hickmayleeun".
 * The second most seen catboy in Volume 1 is the bald one.
 * The bald catboy appears in "New Ghoul @ School", "Party Planners", "Blue Lagoona", "Copy Canine", "The Hot Boy", "Bad Scare Day", "A Bad Zituation", "Mad Science Fair", "Horrorscope", "A Scare of a Dare".
 * The third catboy was only occasionally seen in Volume 1, often talking with the green cyclops girl. He too has pink skin, but his hair is purple and hangs down.
 * The talkative catboy appears in "New Ghoul @ School", "Party Planners", "Blue Lagoona", "A Bad Zituation" and "Freedom Fight".
 * During the episodes that the Fear Squad tried to get one million hits on FrightTube, a purple version of the basic catboy showed up. Despite his rare appearance, he definitely was not a wrongly colored basic catboy, as the basic catboy jumped out of his locker towards the end of "Fatal Error".
 * The purple catboy appears in "Falling Spirits" and "Fatal Error".
 * Introduced mid-Volume 2, yellow catboy is yet another variation of the basic catboy, this time cast in yellow.
 * The yellow catboy appears in "Desperate Hours", "Fright On!" and "Super Fan".

Dark circles boy
The dark circles boy is one of the most common backgrounders, comprising four variants. It is unclear what kind of monster they are. In "Fright On!" and "Ghosts with Dirty Faces", the green-skinned one was shown among the zombie crowds, but he also appeared as member of the debate team in "Fear-A-Mid Power", an activity that isn't very zombie-like. He also never displayed the regular zombie trait of slowness.


 * The most often seen dark circles boy is a green of skin. He is a member of the Monster High debate team, as seen in "Fear-A-Mid Power". Frankie Stein shocked him trying to stop another student in "Horrorscope" and Cleo hypnotized him to do her bidding in "Idol Threat". In "Rumor Run Wild", Draculaura remarks that he is cute, while he was seen dancing with the stitched-up mouth girl in "Fright On!". "He has a small line of dialogue in "Clawditions". He became a member of the casketball team sometime prior to Volume 2 and played a friendly match with his teammates in the Monster High hallways in "Beast Friends". His character model has been reused once for a different character: an adult photographer in "Neferamore".
 * The green-skinned dark circles boy appears in "New Ghoul @ School", "Jaundice Brothers", "Talon Show", "Party Planners", "Copy Canine", "Clawditions", "Freedom Fight", "Shock and Awesome", "Mad Science Fair", "The Good, the Bad and the Fabulous", "Rumor Run Wild", "Horrorscope", "Idol Threat", "Hatch Me If You Can", "Date of the Dead", "Why We Fright", "Fear-A-Mid Power", "Beast Friends", "Varsity Boos", "Gloomsday", "Falling Spirits", "Fatal Error", "Witch Trials", "Queen of the Scammed", "Frightday the 13th", "HooDoo You Like?", "Fear Pressure", "Fear the Book", "Miss Infearmation", "Hyde and Shriek", "Daydream of the Dead", "Nefera Again", "Frost Friends", "Hiss-teria", "Phantom of the Opry", "The Bermuda Love Triangle", "Here Comes Treble", "Rising From the Dead", "Monster Mashionals Part 2", "Fright On!", "Fashion Emergency", "Super Fan", "Zom-Beach Party" and "Ghosts with Dirty Faces".
 * There exists a minor dark circles boy who only appeared in the show's intro sequence. He has a green skin like the most popular version, but instead of brown hair standing up, he has a small green mohawk. He is seen talking with the head-tentacled five-eyed aqua boy.
 * There exists a minor dark circles boy who only appeared in "Talon Show". He has a green skin like the most popular version, but instead of brown hair standing up, he has blue-green hair hanging down.
 * The rarely seen white-skinned dark circles boy is bald. Frankie invited him for Draculaura's borthday part in "Party Planners", but he declined, knowing a surprise party for the both of them was being organized.
 * The white-skinned dark circles boy appears in "New ghoul @ School", "Substitute Creature", "Party Planners", "The Hot Boy".
 * A third dark circles boy is unique to the webisode "Fear-A-Mid Power". He is a purple version of the basic green-skinned dark circles boy, but dressed in the green outfit of one of the amoeba boys.
 * A fourth dark circles boy was introduced mid-Volume 2. He is recognizable by his red skin.
 * The red-skinned dark circles boy appears in "Desperate Hours", "Fright On!", "Super Fan".

Thin-faced boy
The thin-faced boy is a background character notable for having two variations that are not immediately recognizable as variations. Presumably, the hooded one was designed first, after which his head was stuck on a generic jock body to create another backgrounder. In Volume 2, a third design was introduced based on the hooded version.
 * The thin-faced boy with a hoodie is the more prominent of the two lasting versions. He likes to play dodgeskull according to "Dodgeskull".
 * The thin-faced boy with a hoodie appears in "New Ghoul @ School", "Talon Show", "Substitute Creature", "Bad Scare Day", "A Bad Zituation", "Clawditions", "Freedom Fight", "Shock and Awesome", "Mad Science Fair", "The Good, the Bad and the Fabulous", "Idol Threat", "Hatch Me If You Can", "Fear-A-Mid Power", "Beast Friends", "Falling Spirits", "Fatal Error", "Screech to the Beach", "Witch Trials", "Don't Cheer the Reaper", "Road to Monster Mashionals", "Queen of the Scammed", "HooDoo You Like?", "Fear Pressure", "Fear the Book", "Miss Infearmation", "Hyde and Shriek", "Daydream of the Dead", "Frost Friends", "The Bermuda Love Triangle", "Here Comes Treble", "Fright On!", "Kind: The Shockumentary", "Fashion Emergency", "Zom-Beach Party" and "Dodgeskull".
 * The thin-faced boy with hair is the less prominent of the two lasting versions.
 * The thin-faced boy with hair appears in "New Ghoul @ School", "Jaundice Brothers", "Substitute Creature", "Party Planners", "Blue Lagoona", "Bad Scare Day", "Totally Busted", "Shock and Awesome", "Mad Science Fair", "The Good, the Bad and the Fabulous", "Rumor Run Wild" and "Idol Threat".
 * The green thin-faced boy is a one-time variations that might be a miscolored version ofthe normal hooded one. However, that would be the only known one, so it's probably not the case. The green thin-faced boy only showed up in "Gloomsday", eating a hotdog.

Skeleton boy with backpack
A backgrounder unique to the webisode "Bad Scare Day", the skeleton boy with a backpack is one of the many skeletons that attend Monster High. During his one appearance, he got shocked by Frankie's switched bolts.



Red-haired skeleton boy
The red-haired skeleton boy is the one skeleton the webisodes keep featuring. There are two variants of him.
 * The red-haired skeleton boy with a beanie is the better known variant. In "Clawditions", he auditioned for a role in Hamlet: The Musical, but it's unknown if he got it. In "Mad Science Fair", he had a or was part of another's invention and presentation. And in "Idol Threat", he was hypnotized by Cleo to step aside. In both "Here Comes Treble" and "Fashion Emergency", he literally dropped his jaw, once for seeing Jackson change into Holt and once for seeing the amazing outfits of Draculaura and her friends. The red-haired skeleton boy with a beanie was animated with beanie or hair at one point in "New Ghoul @ School". His character model has been reused once for a different character: an adult photographer in "Neferamore".
 * The red-haired skeleton boy with a beanie appears in "New Ghoul @ School", "Talon Show", "Party Planners", "Blue Lagoona", "A Bad Zituation", "Clawditions", "Freedom Fight", "Freakout Friday", "Shock and Awesome", "Mad Science Fair", "Rumor Run Wild", "Horrorscope", "Idol Threat", "Hatch Me If You Can", "Date of the Dead", "Why We Fright", "Fear-A-Mid Power", "Varsity Boos", "Falling Spirits", "Fatal Error", "Screech to the Beach", "Don't Cheer the Reaper", "Road to Monster Mashionals", "Queen of the Scammed", "Frightday the 13th", "HooDoo You Like?", "Fear the Book", "Desperate Hours", "Miss Infearmation", "Hyde and Shriek", "Daydream of the Dead", "Nefera Again", "Back-To-Ghoul", "Frost Friends", "Hyde Your Heart", "Ghostly Gossip", "The Bermuda Love Triangle", "Here Comes Treble", "Rising From the Dead", "Monster Mashionals Part 2", "Fright On!", "Fashion Emergency", "Super Fan" and "Uncommon Cold".
 * The red-haired skeleton boy with a cap may not actually have red hair, as the cap's visor is in front of it, but otherwise does share the beanie version's head model. He only appears in "New Ghoul @ School" and "Freedom Fight", attending Zarr's and Hackington's classes.

Skeleton boy
The skeleton boy is one of the three Volume 1 backgrounders whose faces were never shown (presumably). He shares his headshape with them and equally is always animated from a back-sideview. He is the only one of the three that doesn't leave one guessing what type of monster he is.
 * The skeleton boy appears in "New Ghoul @ School", "Jaundice Brothers", "Party Planners", "Blue Lagoona", "Copy Canine", "Bad Scare Day", "A Bad Zituation" and "Idol Threat".



Other skeleton boy
The other skeleton boy appears solely in "Freedom Fight", where he was having a friendly chat with Heath Burns while Hackington explained today's science class. It is possible he and skeleton boy are the same, but they have different sleeves to their jackets. This suggests they are not the same, though it remains possible the lack of flames is an animation error.



Bald 'human' boy
The bald 'human' boy is one of the three Volume 1 backgrounders whose faces were never shown. He shares his headshape with them and equally is always animated from a back-sideview. Unlike the other two, there is absolutely no telling what kind of monster he is. He is often animated without his ear and eyebrow.
 * The bald 'human' boy appears in "New Ghoul @ School", "A Bad Zituation", "Horrorscope", "Idol Threat", "Screech to the Beach" and "HooDoo You Like?".



Pink cyclops boy
The pink cyclops boy is a backgrounder consisting of four versions, one being featured a lot, the second being part of the intro sequence, the third being hard not to miss and the fourth having only a single appearance.
 * The red-haired pink cyclops boy is one of the background regulars. He is a member of the monster High debate team, as shown in "Fear-A-Mid Power", and a member of the casketball team, as shown in "Varsity Boos". And according to "Dodgeskull", he's also got a like for dodgeskull. As with most backgrounders that wear cargo shorts, he goes shoeless, except for during "Varsity Boos" and when he attended Cleo's party in "Miss Infearmation". He seems to have a thing for girls who also have another-number-than-two eyes, as in "Fright On!" he romantically shared ice cream with the green cyclops girl and later danced with the three-eyed girl.
 * The red-haired pink cyclops boy appears in "New Ghoul @ School", "Talon Show", "Substitute Creature", "Party Planners", "Freedom Fight", "Freakout Friday", "Shock and Awesome", "Mad Science Fair", "The Good, the Bad and the Fabulous", "Rumor Run Wild", "Fur Will Fly", "Horrorscope", "Idol Threat", "Hatch Me If You Can", "Why We Fright", "Fear-A-Mid Power", "Beast Friends", "Varsity Boos", "Falling Spirits", "Fatal Error", "Screech to the Beach", "Witch Trials", "Don't Cheer the Reaper", "Road to Monster Mashionals", "Queen of the Scammed", "Frightday the 13th", "HooDoo You Like?", "Fear Pressure", "Fear the Book", "Desperate Hours", "Miss Infearmation", "Hyde and Shriek", "Daydream of the Dead", "Back-to-Ghoul", "Ghostly Gossip", "Hiss-teria", "Phantom of the Opry", "The Bermuda Love Triangle", "Here Comes Treble", "Neferamore", "Rising From the Dead", "Monster Mashionals Part 2", "Fright On!", "Super Fan" and "Dodgeskull".
 * The intro black-haired pink cyclops boy only appeared in the show's intro sequence. His head is that of the show black-haired pink cyclops boy, but his body an unfinished version of the red-haired pink cyclops boy.
 * The purple-haired pink cyclops boy is by far less featured than the forelock version. Rather than baggy clothes, he has jock's clothes.
 * The purple-haired pink cyclops boy appears in "New Ghoul @ School" and "Freedom Fight".
 * The show black-haired pink cyclops boy has received only one appearance, in "Freedom Fight". His head is that of the unfinished model of the red-haired pink cyclops boy that is part of the intro of the Monster High webisodes, but his body is a generic jock's.

Mohawk boy
The mohawk boy is an elusive backgrounder exclusive to the webisode "Freedom Fight", where he was on-screen for one shot in the back, attending Hackington's mad science class.



Giant boy
The giant boy is one of the handful of Volume 1 backgrounders that only showed up once, in his case in "Party Planners", where he attended Frankie's and Draculaura's birthday party. He was earlier asked by Frankie to come to Draculaura's birthday party, but declined, knowing Frankie's and Draculaura's friends were planning one for the both of them.



Scarecrow boy
The scarecrow boy is one of the few background simulacra and also one of the handful of Volume 1 backgrounders that only showed up once, in his case in "Bad Scare Day". He socialized with Frankie over the choice of creepeteria food, but her switched bolts magnetized her, causing the scarecrow boy's sack-face staples to be pulled out. This was apparently rather traumatizing to him.



Nerdy boy
The nerdy boy is presumably a troll or goblin, and one of the handful of Volume 1 backgrounders that made only one appearance in Volume 1, though he has the luck to be featured too in one Volume 2 webisode. In "Mad Science Fair", he got captured by his own project, and in "Daydream of the Dead", he was part of the comic book lover crowd Ghoulia dreamed up.



Two-headed boy
The two-headed boy is a monster with two heads, but seemingly no mouth(s). It is not known whether the two heads are separate individuals or the same guy.
 * The two-headed boy appears in "New Ghoul @ School", "Substitute Creature", "Party Planners", "Bad Scare Day" and "Falling Spirits".

Mummy boy
Of the four mummies at Monster High, the mummy boy appears the least well-preserved, suggesting him to be of lower standing than the De Niles and Mummy. He is one of the few backgrounders only to be animated going sideways.
 * The mummy boy appears in "New Ghoul @ School", "Jaundice Brothers", "The Hot Boy" and "Bad Scare Day".



Amoeba boy
There are up to three amoeba boys walking around on Monster High ground.


 * The amoeba boy in a green jacket is the most often seen amoeba boy. Because of this, it can be assumed that an amoeba boy wearing an alternative outfit for a special occasion is him. As such, it is he who is assumed to be the amoeba boy on the debate team.
 * The amoeba boy in a green jacket appears in "New Ghoul @ School", "Jaundice Brothers", "Talon Show", "Substitute Creature", "Party Planners", "Copy Canine", "The Hot Boy", "Photo Finish", "A Bad Zituation", "Clawditions", "Freedom Fight", "The Good, the bad and the Fabulous", "Rumor Run Wild", "Horrorscope", "Idol Threat", "Hatch Me If You Can", "Date of the Dead", "Why We Fright", "Fear-A-Mid Power", "Beast Friends", "Varsity Boos", "Falling Spirits", "Fatal Error", "Screech to the Beach", "Don't Cheer the Reaper", "Road to Monster Mashionals", "Frightday the 13th", "HooDoo You Like?", "Fear Pressure", "Desperate Hours", "Miss Infearmation", "Hyde and Shriek", "Daydream of the Dead", "Nefera Again", "Back-To-Ghoul", "Abominable Impression", "Frost Friends", "Hyde Your Heart", "Ghostly Gossip", "Hiss-teria", "Phantom of the Opry", "The Bermuda Love Triangle", "Here Comes Treble", "Dueling Personality", "Rising From the Dead", "Fright On!", "Super Fan" and "Uncommon Cold".
 * The amoeba boy in a red jacket occasionally shows up.
 * The amoeba boy in a red jacket appears in "New Ghoul @ School", "Jaundice Brothers", "Substitute Creature", "Party Planners", "Blue Lagoona", "The Hot Boy", "Bad Scare Day", "A Bad Zituation", "Freedom Fight", "Mad Science Fair", "Horrorscope", "Varsity Boos", "Fear the Book".
 * The amoeba boy in a purple shirt is the elusive variant. See the locker group for more information.

Three-lights robot boy
The three-lights robot is one of the two robots at Monster High, the other being part of the locker group.
 * The three-lights boy appears in "New Ghoul @ School", "Jaundice Brothers", "Substitute Creature", "Party Planners", "The Hot Boy", "Bad Scare Day", "A Bad Zituation", "Mad Science Fair", "Rumor Run Wild", "Idol Threat" and "Varsity Boos".



Sack-head boy
The sack-head boy is a very social backgrounder, who can be seen conversing with roughly everyone throughout the webisodes. In "Idol Threat", Cleo hypnotized him to make way for her and her friends, while in "Rumor Run Wild", he bumped into Frankie while she was texting, causing Cleo's rumor to be further adjusted. He was shocked by Frankie in "Uncommon Cold" when the latter got sick.
 * The sack-head boy appears in "New Ghoul @ School", "Jaundice Brothers", "Talon Show", "Substitute Creature", "Party Planners", "Blue Lagoona", "The Hot Boy", "Photo Finish", "A Bad Zituation", "Freedom Fight", "Shock and Awesome", "Mad Science Fair", "Rumor Run Wild", "Horrorscope", "Idol Threat", "Hatch Me If You Can", "Date of the Dead", "A Scare of a Dare", "Why We Fright", "Varsity Boos", "Falling Spirits", "Fatal Error", "Road to Monster Mashionals", "HooDoo You Like?", "Fear Pressure", "Fear the Book", "Desperate Hours", "Miss Infearmation", "Hyde and Shriek", "Daydream of the Dead", "Nefera Again", "Back-To-Ghoul", "Abominable Impression", "Frost Friends", "Ghostly Gossip", "Hiss-teria", "Phantom of the Opry", "The Bermuda Love Triangle", "Here Comes Treble", "Monster Mashionals Part 2", "Fright On!", "Kind: The Shockumentary" and "Uncommon Cold".



Lips boy
The lips boy exist and if there's anything notable about him, it's that that's the most that can be said about him.
 * The lips boy appears in "New Ghoul @ School", "Substitute Creature", "Party Planners", "The Hot Boy", "Bad Scare Day", "Mad Science Fair", "Rumor Run Wild", "Idol Threat", "Varsity Boos" and "Fear the Book".



Pink scale boy
The pink scale boy is one of the three Volume 1 backgrounders whose faces were never shown. He shares his headshape with them and equally is always animated from a back-sideview.
 * The pink scale boy appears in "New Ghoul @ School", "Party Planners", "Copy Canine", "The Hot Boy", "A Bad Zituation", "Mad Science Fair", "Rumor Run Wild", "Horrorscope" and "Witch Trials".



Blue scale boy
The blue scale boy is one of the few backgrounders who has gotten a line of dialogue, his being in "Substitute Creature". He is a member of the swim team, as seen in "New Ghoul @ School".
 * The blue scale boy appears in "New Ghoul @ School", "Substitute Creature", "The Hot Boy", "Totally Busted", "Rumor Run Wild", "Horrorscope" and "Idol Threat".

Five-eyed aqua boy
While often perceived as possessing three eyes, the five-eyed aqua boy actually has five. There's the central eye, two eyes roughly 3/4th its size next to it and next to them, two tiny eyes roughly a tenth of the central eye. He is also has two very tiny fangs. There are three versions of the five-eyed aquatic boy.


 * The five-eyed aqua boy with crest is the most often seen version. According to "New Ghoul @ School" and numerous Volume 2 webisodes, he is a member of the swim team. In "Party Planners", he attended Draculaura's and Frankie's birthday party. In "Fear-A-Mid Power", he participated in a swimming competition, but was shocked when Frankie Stein fell into the pool. He was accidentally petrified by Deuce Gorgon in "Back-to-Ghoul" when the latter checked out the new girl, Abbey, and in "Zom-Beach Party", a large tentacle stole his icecream. He was drawn lacking his crest in "Blue Lagoona". His character model has been reused once for a different character: an adult photographer in "Neferamore".
 * The five-eyed aqua boy with crest appears in "New Ghoul @ School", "Substitute Creature", "Talon Show", "Party Planners", "Blue Lagoona", "The Hot Boy", "Bad Scare Day", "A Bad Zituation", "Freedom Fight", "Mad Science Fair", "The Good, the Bad and the Fabulous", "Horrorscope", "Idol Threat", "Hatch Me If You Can", "Fear-A-Mid Power", "Beast Friends", "Varsity Boos", "Falling Spirits", "Fatal Error", "Screech to the Beach", "Witch Trials", "Don't Cheer the Reaper", "Road to Monster Mashionals", "Queen of the Scammed", "Frightday the 13th", "HooDoo You Like?", "Fear Pressure", "Fear the Book", "Miss Infearmation", "Hyde and Shriek", "Daydream of the Dead", "Back-To-Ghoul", "Abominable Impression", "Frost Friends", "Hyde Your Heart", "Ghostly Gossip", "Hiss-teria", "Phantom of the Opry", "The Bermuda Love Triangle", "Here Comes Treble", "Dueling Personality", "Neferamore", "Rising From the Dead", "Fright On!", "Kind: The Shockumentary", "Fashion Emergency", "Super Fan", "Zom-Beach Party", "Dodgeskull", "Uncommon Cold" and "Ghosts with Dirty Faces".
 * The alternative five-eyed aqua boy with crest has the same head as the normal five-eyed aqua boy with crest, but wears a blue sweater and baggy pants. He is presumably the one in black trunks that got snatched by a bunch of tentacles in "Road to Monster Mashionals".
 * The alternative five-eyed aqua boy appears in "New Ghoul @ School", "Substitute Creature", "Bad Scare Day", "Varsity Boos" and "Road to Monster Mashionals".
 * The five-eyed aqua boy with head-tentacles is, like the alternative five-eyed aqua boy with crest, a less prominent version. He only appears in "Talon Show" and the intro sequence. In the intro ssequence, he is talking with the mohawk-wearing green-skinned dark circles boy.

Fish-face boy
The fish-face boy is one of the handful of Volume 1 backgrounders that only showed up once, in his case in "Party Planners", where he participated in blowing out the candles atop Frankie's and Draculaura's birthday cake.



Vampire couple
The vampire couple consists of a tall, blue vampire boy and a pink, short vampire girl. For reasons unknown, they are drawn in a style different from the rest of the cartoon. They are notable for being the 'characters' first shown each webisode, as the intro window zooms out on them. They always appear together except for once in "Copy Canine", where the vampire girl made her SAT.
 * The vampire couple appears in "Party Planners", "Copy Canine", "The Hot Boy" and "Totally Busted"



Zombies
Zombies are the type of backgrounders that get designed en masse and thus tend to be incredibly similar. The Volume 1 zombies were designed in two sets: the white-skinned ones that showed up only in "New Ghoul @ School" as the members of the chess club, and the green-skinned ones that are part of the zombie flash mob in "New Ghoul @ School" and "Fear Squad".

Metal duo
The metal duo are two small, male monsters that appeared exclusively in "The Hot Boy", where they just walked through some hallway or another. The duo comprises an aquatic monster and an undead. The undead one's high scare level is probably the reason their appearance was rather lowkey and never repeated.

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Locker group
The locker group is a collection of six male monsters that tend to get shocked by Frankie Stein's charge. The group comprises a monkey boy, an unidentifiable type of ghoul, one of the three amoeba boys, a devil boy, a yellow robot and an elephant boy. The devil boy and yellow robot also attend Frankie's and Draculaura's party in "Party Planners".
 * Members of the locker group appear in "New Ghoul @ School", "Bad Scare Day" and "Party Planners".

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Laughing group
The laughing group comprises three monsters: an pink ape boy, a green female monster with a '50s appearance and a grey-blue male monster with fangs protruding from his lower jaw. These three are almost limited to one appearance, namely in "A Bad Zituation", where they laughed at Frankie for her zit. However, the fanged boy appeared one other time, as a guest at Frankie's and Draculaura's birthday party in "Party Planners".

Creepeteria group
The creepeteria group includes three students only seen once, in "Bad Scare Day". They are a wererat, a pig-type monster and an undead of some kind. When Frankie Stein was magnetized by her bolts' polarity being reversed, they were bombarded with metal kitchenware and only just kept themselves unharmed.

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Volume 2 backgrounders
The backgrounders introduced in Volume 2 (that aren't based on a Volume 1 design) show an increased confidence and creative freedom in Monster High's monster theme. Roughly every Volume 2 backgrounder has a unique body build and clear cues as to what type of monster they are. Many of them have designs indistinguishable from the ones made for actual characters. As a result, they have supplanted a large portion of the Volume 1 backgrounders.

Bird girl
There is a huge number of birdpeople in existence, but the bird girl backgrounder is usually thought to be a harpy on account of harpies being the most well-known. The bird girl can often be found in the company of the faun boy.
 * The bird girl appears in "Falling Spirits", "Fatal Error", "Fear Pressure" and "Hyde and Shriek", "Nefera Again", "Frost Friends", "Monster Mashionals Part 1", "Fright On!", "Kind: The Shockumentary", "Super Fan" and "Dodgeskull".

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Plant girl
The plant girl is one of the first two Volume 2 backgrounders introduced and one of the few backgrounders to have gotten a line of dialogue, hers being in "Fear Pressure", during which she told Clawdeen that she was touched by the story Clawdeen had been meaning to tell Draculaura. In "Why We Fright", Heath Burns picked a flower from her hair to give to Draculaura.
 * The plant girl appears in "Why We Fright", "Fear Pressure", "Fright On!", "Kind: The Shockumentary", "Super Fan" and "Ghosts with Dirty Faces".

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Ice girl
Suggested to be made from ice or, more rarely, glass, the ice girl appears to be a living sculpture or an elemental. It could be possible that she is based off of the tale of Frozen Charlotte that tells of a girl freezing to deth on a sleigh ride. She is one of the backgrounders only animated to walk sideways.
 * The ice girl appears in "Falling Spirits", "Fear Pressure", "Miss Infearmation", "Hyde and Shriek", "Daydream of the Dead", "Nefera Again", "Abominable Impression", "Hyde Your Heart", "Phantom of the Opry", "The Bermuda Love Triangle" and "Fright On!".

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Horned girl
The horned girl is a backgrounder introduced mid-Volume 2. She's one of the girls fighting in "Kind: The Shockumentary", but she's the only one to not appear when the rest it shown to resolve their conflicts.
 * The horned girl appears in "Fear the Book", "Daydream of the Dead", "Nefera Again", "Frost Friends", "Ghostly Gossip", "Here Comes Treble", "Monster Mashionals Part 1", "Fright On!", "Kind: The Shockumentary", "Fashion Emergency" and "Super Fan".

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Young three-eyed boy
The young three-eyed boy is unique to the webisode "Varsity Boos", where he attended the festivities by and for the Monster High student body. Though he looks rather young to be in high school, he still probably is a student.

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Mini-devil boy
The mini-devil boy is one of Manny Taur's favored victims, becuase he's small, pretty much defenseless and red. The mini-devil boy has been chased by Manny in "Abominable Impression" and "Fright On!", and was saved in the former by Abbey and in the latter by the Lunch Lady.
 * The mini-devil boy appears in "Abominable Impression", "Fright On!" and "Super Fan".

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Troll boy
The troll boy is one of the first two Volume 2 backgrounders introduced and a very unfortunate soul in general. If his clumsiness doesn't get him in trouble, random tentacles will do the work for him. In "Why We Fright", he was unable to reach his books, which Clawd then picked up for him. This was followed by him slipping, but fortunately Clawd helped again by catching his books. In "Miss Infearmation", he managed to ward off a tentacle comign from his locker, only to be caught by another. He was again attacked by tentacles in "Ghostly Gossip" and towards the end of "Fright On!".
 * The troll boy appears in "Why We Fright", "Miss Infearmation", "Abominable Impression", "Ghostly Gossip" and "Fright On!".

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Blob boy
The blob boy might just as well be a blob girl or a blob 'it', but is usually thought to be male. In "Varsity Boos", the blob boy participated in a funfair game to knock a pyramid of bottles over. Deuce Gorgon, in an attempt to make Cleo laugh, petrified the bottles before the ball hit them, leaving the blob boy confused as to how the pyramid hadn't fallen.
 * The blob boy appears in "Varsity Boos", "Fright On!", "Kind: The Shockumentary" and "Dodgeskull".

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Faun boy
The faun boy can usually be found in the company of the bird girl.
 * The faun boy appears in "Falling Spirits", "Fatal Error", "Fear Pressure", "HooDoo You Like?", "Hyde and Shriek", "Hiss-teria", "Fright On!", "Kind: The Shockumentary", "Super Fan", "Dodgeskull" and "Ghosts with Dirty Faces".

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Red-eyed skeleton boy
The red-eyed skeleton boy high-fived with the green cyclops girl when they heard the Fear Squad was invited to Gloom Beach in "Fatal Error".
 * The red-eyed skeleton boy appears in "Fatal Error", "HooDoo You Like?", "Miss Infearmation" and "Fright On!".

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Grey boy
The grey boy is a backgrounder exclusive to the webisode "Frost Friends". He is among the students who watch the swim team competition.

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Centaur boy
For the longest time, it was not clear what kind of monster the he centaur boy was because nothing more than his torso was shown. Only in "Fright On!" did one scene offer a glimpse at his entire body, revealing him to be a centaur.
 * The centaur boy appears in "Fear Pressure", "Hiss-teria" and "Fright On!".

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Yellow shirt boy
The yellow shirt boy is a backgrounder almost solely drawn from behind and almost always placed at the side of the screen.
 * The yellow shirt boy appears in "Varsity Boos", "Fatal Error", "Daydream of the Dead", "Nefera Again" and "Fright On!".

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Yellow cyclops boy
The yellow cyclops boy only appeared in the webisodes as an adult reporter, not a student. However, all the other reporters were either fully recycled models or possessed a headmodel that was recycled. Following this shared trait, it can be assumed a yellow cyclops boy attends Monster High.

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Large cyclops boy
The large cyclops boy is a member of the Monster High casketball team and one of the few backgrounders to get a line of dialogue. In "Beast Friends", he played a game in the hallways with Clawd, the basic catboy and the normal green dark circles boy. During the game, he punched the latter two out of the way while challenging Clawd. He also enjoys a game of dodgeskull according to "Dodgeskull".
 * The large cyclops boy appears in "Beast Friends", "Super Fan", "Dodgeskull" and "Uncommon Cold".

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Dinosaur boy
The dinosaur boy is a member of the casketball team, as seen in "Super Fan". In "Hiss-teria", Cleo accidentally spilled his lunch when she was frightened by a spider.
 * The dinosaur boy appears in "Fear Pressure", "Daydream of the Dead", "Nefera Again", "Hiss-teria", "Fright On!", "Fashion Emergency" and "Super Fan".

Orc boy
The orc boy is one of the two unfortunate backgrounders that tend to be around when HooDude gets harmed, meaning that the pain is transferred to him. This happened in both "Ghostly Gossip" and "Fright On!"
 * The orc boy appears in "Falling Spirits", "HooDoo You Like?", "Fear Pressure", "Miss Infearmation", "Daydream of the Dead", "Abominable Impression", "Frost Friends", "Ghostly Gossip", "Hiss-teria", "Here Comes Treble", "Fright On!", "Dodgeskull" and "Hickmayleeun".

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Blue boy
While in general an average student, the blue boy has a penchant for misfortune. In "Frightday the 13th", the blue boy was assaulted by a bunch of tentacles coming from his locker. He is also one of the two unfortunate backgrounders that tend to be around when HooDude gets harmed, meaning that the pain is transferred to him. This happened in both "Ghostly Gossip" and "Fright On!".
 * The blue boy appears in "Falling Spirits", "Fatal Error", "Frightday the 13th", "HooDoo You Like?", "Fear Pressure", "Miss Infearmation", "Hyde and Shriek", "Daydream of the Dead", "Nefera Again", "Frost Friends", "Ghostly Gossip", "Here Comes Treble" and "Fright On!".

Ice gorilla boy
The ice gorilla boy is easily the most nonconventionally designed backgrounder in the series.
 * The ice gorilla boy appears in "Fear Pressure", "Daydream of the Dead", "Nefera Again", "Hyde Your Heart" and "Fright On!".

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Pale aqua boy
The pale aqua boy is a member of Monster High's swim team. While he likely is a very good swimmer, he is less fast than Gil and Lagoona.
 * The pale aqua boy appears in "Fear Pressure" and "Frost Friends".

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Piranha-head boy
The piranha boy has a piranha as head in a way that makes it look like he has a real head underneath. This probably is not the case though.
 * The piranha-head boy appears in "Fear Pressure", "Hiss-teria", "The Bermuda Love Triangle", "Fright On!" and "Hickmayleeun".

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Small green boy
The small green boy is likely an undead of some kind, though he would be too nimble for a zombie. In "Fright On!", he became a servant of the Belfry Prep vampires.
 * The small green boy appears in "Fear Pressure", "Nefera Again", "Fright On!" and "Hickmayleeun".

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Stone boy
Suggested to be made from stone, the stone boy appears to be a living sculpture or an elemental.
 * The stone boy appears in "Falling Spirits", "HooDoo You Like?", "Fear Pressure", "Miss Infearmation", "Nefera Again", "Abominable Impression", "Phantom of the Opry" and "Fright On!".

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Ogre boy
The ogre boy is a one-time backgrounder. His head, colors excluded, is the same as the one of the hunchbacked boy, but his body is a standard jacket-wearing one. His only appearance is in "Fear Pressure", where he and the semi-fly boy bullied the new human student, Jackson. His one appearance includes a line of dialogue.

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Eyeball boy
Instead of a regular head, the eyeball boy has a giant eyeball on his shoulders.
 * The eyeball boy appears in "Fear the Book", "Daydream of the Dead", "Nefera Again", "Fright On!" and "Super Fan".

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Hunchbacked boy
The hunchbacked boy is slightly less elusive than his head-colleague, the ogre boy.
 * The hunchbacked boy appears in "Fear the Book" and "Nefera Again".

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Fly boy
The fly boy is a blue humanoid fly. His head was reused for the semi-fly boy.
 * The fly boy appears in "Fear the Book", "Daydream of the Dead", "Nefera Again", "Hiss-teria", "Here Comes Treble", "Fright On!", "Super Fan" and "Hickmayleeun".

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Semi-fly boy
The semi-fly boy is a one-time backgrounder. His head, colors excluded, is the same as the one of the fly boy, but his body is a standard jacket-wearing one. His only appearance is in "Fear Pressure", where he and the ogre boy bullied the new human student, Jackson.

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Mantis boy
The mantis boy is a green humanoid mantis.
 * The mantis boy appears in "Fear Pressure", "Hiss-teria", "Fright On!" and "Super Fan".

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Zombies
In contrast to the Volume 1 zombies, the Volume 2 zombies rarely move in mobs. They do usually hang out together, but in small numbers. Many individual designs exist among the Volume 2 zombies, including girl zombies, which were absent in Volume 1. Of these designs, there are six main: the three zombie girls with blond, orange and pink hair, and the three boys with purple, brown and orange hair. The boy with purple hair has been made a full character named Don of the Dead, while the two other boys, the blond girl and the pink-haired girl received one-time color variations in "Fear-A-Mid-Power". In addition to these six, there's a small zombie boy who may or may not be a student at Monster High, a zombie with a perpetual sleepy face, a trio of zombie boys and one one-time zombie girl in a red dress.
 * The zombie girl with blond hair appears in "Fear-A-Mid-Power", "Fear Pressure", "Fright On!", "Super Fan" and "Ghosts with Dirty Faces".
 * The zombie girl with orange hair appears in "Fear-A-Mid-Power", "Fright On!", "Kind: The Shockumentary" and "Ghosts with Dirty Faces". Her model was reused for a fearleader from a competing school in "Monster Mashionals Part 1".
 * The zombie girl with pink hair appears in "Fear-A-Mid-Power", "Fright On!" and "Ghosts with Dirty Faces".
 * The zombie boy with brown hair appears in "Fear-A-Mid-Power", "Varsity Boos", "Falling Spirits, "Fear Pressure", "Daydream of the Dead", "Fright On!", "Fashion Emergency", "Dodgeskull" and "Ghosts with Dirty Faces".
 * The zombie boy with orange hair appears in "Fear-A-Mid-Power", "Daydream of the Dead", "Fright On!", "Dodgeskull" and "Ghosts with Dirty Faces".
 * The small zombie boy appears in "Fear-A-Mid-Power".
 * The zombie boy with a sleepy face appears in "Hyde and Shriek", "Daydream of the Dead".
 * The bald zombie boy appears in "Hyde and Shriek", "Daydream of the Dead", "Nefera Again".
 * The other zombie boy with brown hair appears in "Hyde and Shriek", "Daydream of the Dead", "Nefera Again".
 * The hunchbacked zombie boy appears in "Hyde and Shriek", "Daydream of the Dead".
 * The zombie girl in red dress appears in "Nefera Again".

Volume 3 backgrounders
Nearly all of the new backgrounders showing up in Volume 3 are the vampires and werewolves introduced in "Fright On!", the special that takes place between Volumes 2 and 3. The one exception is a giraffe boy that appeared in the promotional webisode "Super Fan", who is based on the Toys R Us mascot Geoffrey the Giraffe.