Characters/adults

To make reading easier, this page is split up in two sections:
 * Monster High staff - The staff and associates of the titular high school, regardless whether they teach or fulfill another function, regardless when they were associated with Monster High, and regardless of the fiction they appear in.
 * Other adults - All the individual, adult characters

All characters within a section are listed alphabetically.

Laboratory assistant
The laboratory assistant is a green-skinned cyclops with red hair and a balding top. He assists Mr. Hackington in "Hatch Me If You Can" by getting eggs for the students. He only appears elsewhere in "Flowers for Slow Moe".

Lagoona's teacher
A teacher of whom only the voice is known, he was heard in the webisode "Parent-Creature Conference". Lagoona Blue is his best student, so much so that he personally wished to tell her parents. Since Lagoona's favorite subject at school is oceanography and no other teacher is confirmed to handle those lessons, it is possible he is the oceanography teacher.

Phantom of the Opera
As said in Holt's Basic diary, Operetta's Campus Stroll diary, and the game Ghoul Spirit, the Phantom of the Opera teaches a keyboard class.

Siren
Mentioned first in Holt's Basic diary, there's a siren at Monster High who gives voice lessons. The Monster High magazine issue of May 2013 revealed her name to be Ms. Siren and her class Voice Training.

Sylphia Flapper
Sylphia Flapper is a dragon woman, and the new teacher of Dragon Whispering at Monster High. Extremely beautiful and fashionable, she soon become the center of attention of nearly everyone at the school. However, it soon transpires that she is using her abilities to brainwash the student body into becoming her followers and to raise an army to strike against humans. Robecca, Rochelle and Venus manage to stop her plans. She appears in the book series Ghoulfriends Forever

Sue Nami
Sue Nami is a water creature, and the assistant of Headless Headmistress Bloodgood. Described as somewhat ugly with a wrestler's physique, she's in charge of keeping things shipshape at Monster High, and takes her job very seriously. She's quite humourless and goes about her tasks with maximum efficiency, often barging past students and soaking them in water. She appears in the book series Ghoulfriends Forever

Moanatella Ghostier
Moanatella Ghostier is a famous fashion designer based in Scaris. She opens up a school for fashion design, to which she invites Clawdeen, Skelita and Jinafire to for a chance to become her apprentice. But there is a sinister motive behind her actions... She appears in Scaris: City of Frights