Cleo de Nile/Generation 1

Cleo is the daughter of the Mummy and is approximately 5,842 years old (give or take a few years) and is going out with Deuce Gorgon.

Personality
Cleo is the royality, and expects everyone to treat her like it too. She is stuck up,too. Usually, her attitude is sellfish, arrogant, and unkind. She is shown to be highly competitive and downright difficult to get along with. She has a rivalry with Clawdeen Wolf, which, according to Ghoulia Yelps's diary, began when Cleo dumped Clawdeen's brother, Clawd, and started dating Deuce Gorgon the next day. Cleo likes to try to trick the other girls or get them in trouble but her efforts always fail.

However, she has been shown to have a heart of gold every now and then. She is kind to Ghoulia Yelps and helps her to overcome her shyness. (Although she has been known to take advantage of Ghoulia and uses her as a personal assistant.)

She can work well with the others if they share a common goal, (like trying to avoid the gym teacher or helping Draculaura find her 'perfect guy'), in which case she becomes the de facto leader of the gang. She shows she can be a highly effective organizer and leader, she just needs to learn how to get along better with others.

In the first season webisodes, Cleo is primarily played as an antagonist. However, in the second season she is finally confronted with her own uncompromising, overbearing nature when the regular Fearleading Squad resigns. Afterwards she slowly starts to become more accepting and accomodating toward Frankie and the girls.

When she gets really upset, Cleo lets loose a glass-shattering super forceful scream and strangely enough in more severe cases starts obsessively cleaning things, like polishing the trophies in the trophy case. This and her rigid perfectionism could be an indication of strong OCD.

There are also hints in the Webisodes about Cleo's fear of the dark, which she writes about in her diary.

Portrayals
In the webisodes and Monster High movie New Ghoul @ School, Cleo's voice is provided by Salli Saffioti, who ironically also provides the voice for Clawdeen Wolf.

In the music video for the Monster High Fright Song, there are several character analogues who received creative interpretation by the video crew. The mummy girl is played by Megan Mackenzi.

Physical Description
Cleo de Nile has flowing black hair with gold highlights. She has dark, tanned skin, and blue eyes. She always wears a crystal birthmark.

Classic Monster
Cleo de Nile is the child of Imhotep, the mummy from Universal's 1932 film The Mummy, directed by Karl Freund and starring Boris Karloff.

The story of The Mummy concerns an archaeological dig which discovers the remains of the Egyptian prince Imhotep. When a member of the expedition reads aloud the Scroll of Thoth, the mummy is brought back to life; he then spends his time searching for the reincarnation of his lover, an ancient princess.

While the princess in The Mummy looks very similar, the most famous portrayal of the character came from Elizabeth Taylor in 1964. Cleo de Nile's style clearly reflects the dark hair with bangs, jewelry and style, and certainly the haughty attitude of the Egyptian princess.

Family
Cleo lives with her father "in this palace that looks like a movie set with servants and all. . . .they're like rockstars or something." In the books, her Dad's name is Ramses de Nile, an antiques dealer.

Friends
Cleo's attitude means she sometimes has an uneasy relationship with the ghouls of Monster High, but they are all friendly with her, except for Clawdeen Wolf. Clawdeen is angry with Cleo for dumping her brother Clawd, though they can be civil when required.

She is particular friends with Ghoulia Yelps, and they even plan their school schedules together. Ghoulia often serves as Cleo's personal assistant (Fear Squad). Cleo sometimes takes Ghoulia for granted, and on several occasions takes advantage of her (Copy Canine, Mad Science Fair).Since Lagoona Blue is a warm-hearted person, she seems to get along easily with Cleo and Cleo never did anything bad to her.

Romance
Cleo is dating Deuce Gorgon. She used to date Clawdeen Wolf's brother Clawd, but according to Ghoulia it ended badly. Doesn't help that Cleo started dating Deuce the next day.

Cleo de Nile in the Monster High books
In the book, Cleo is much nicer to the other girls, even Clawdeen. Cleo and Melody have a constant feud, started with Melody accidentally bumping into Cleo in the school cafeteria. Cleo kisses Jackson, turning him into DJ, and Melody eventually starts using Deuce against her. Cleo helps out with Frankie trying to get the RADs out of hiding when she learns Deuce is going to the Monster Mash with Melody. It is said that Cleo's full name is Cleopatra De Nile. Cleo also calls Melody "Melodork" in the first book and in the second book, although at the end she ends up trusting Melody.

Cleo's Official Facebook Description
Cleo totally rules Monster High. She’s the daughter of The Mummy and her tightly wound wrappings are not only a sign of her monster heritage, but are also a royally awesome fashion statement. She has to be careful though – if she’s not wrapped in at least one bandage, she’ll disappear into dust. Technically, the ghoul is 5,842 years-old but is only now getting the chance to be a teenager (can you believe she was perfectly preserved in a royal burial chamber for thousands of years?). Thanks to many years in totally tight quarters, she’s way afraid of the dark… but don’t tell her I told you that. Her Egyptian cobra, Hissette can be a little ghastly from time to time, but I hear her hiss is way worse than her bite.

Basic
Cleo wears a strapless jumpsuit made of yellow-colored mummy wrappings, and a blue wrapped transparent top. She carries her phone on a strap on her thigh. She accessorizes with gold jewelry and mummy wrappings.

Dawn of the Dance
Cleo wears a green and yellow off-the-shoulder dress with one sleeve, and tights on one leg, with green shoes with little diamonds on the heels.

Gloom Beach
Cleo wears a yellow and black striped two-piece bathing suit with a strap across the abdomen, a matching leg warmer on her left leg, and a matching wrist warmer on her right arm. Her sunglasses, waist wrap, lipstick and toe sandals are teal blue.Her hair is pulled back a little too.

Trivia

 * Cleo is the oldest out of all the Monster High characters (or at least in the cast).
 * Even thogh Cleo isn't really a nice person, everyone tries to get on her good side (except for Clawdeen who dosen't like her).
 * Cleo de Nile is the only character known dating someone.
 * Her best friend is Ghoulia who everyone thinks she treats as a servant then a friend.