To make reading easier, this page is split up in three 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.
Parents - The Parents of Monster High's students.
Other adults - All the individual, adult characters that appear in Monster High, but aren't related to the school.
All characters within a section are listed alphabetically.
Headless Headmistress Bloodgood is head of Monster High, and in charge of discipline. She takes after her name, and is able to remove her head from her body. A firm believer in monster equality, she strives to foster friendship and fairness between the different monster races, and encourages her students to always be themselves.
Mr. Hackington is Monster High's Mad Science teacher. A former assistant to many famous scientists, Mr Hack's passion for science is almost as strong as his love of torturing his students with tough quizzes and long lectures.
A classic hunch-backed lab assistant who teaches gym class. Coach Igor has one peg leg. When he takes over Study Howl, he makes the students run laps. You can never rest with a coach like this!
One of the first teachers of Monster High, Irene Maiden got herself somehow stuck in a Greek statue without anyone knowing. She remained locked up for 2000 years, until Frankie Stein and Cleo de Nile accidentally freed her by breaking the statue in "Totally Busted". It is unknown if she resumed her job as a teacher.
Ms. Kindergrubber is Monster High's Home Ick teacher and based on the witch from "Hansel and Gretel". She loves cooking and is constantly encouraging her students to cook and eat more, claiming they're 'all skin and bones'. In Ever After High, there is a daughter of the Candy Witch from Hansel and Gretel, and there is the actual witch herself.
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.
Lou Zarr, a human, serves as a substitute teacher when one of the regular staff are unavailable, as seen in the webisode "Substitute Creature" and in the television special "New Ghoul @ School". He is a stiff, humorless, uncompromising hardnose about education. His lessons are shown to be so boring they tend to put students, and even himself, to sleep.
Mr. Ogrethor is the custodian at Monster High. He has very sensitive ears and gets irritable when ever someone plays loud music.
Mr. Rotter is the teacher of Dead Languages, and also teaches other classes around the school. The strictest, most humorless teacher in Monster High, he has little patience for foolishness in his classes, and makes it a point to never give his students 'A' grades.
The school photographer is an elderly man of unknown monster type. He is kind-hearted and goes dressed in clothes long overdue for repair. Besides being responsible for taking pictures, he also makes short educational movies for Monster High.
Sue Nami is a water elemental, 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 refers to every student she meets as 'non-adult entity'.
Sylphia Flapper is a dragon woman who becomes the new teacher of Dragon Whispering at Monster High. Extremely beautiful and fashionable, she soon becomes 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 as part of a sinister plan to take over the town...
Verizhe is an invisible man seen in the Monster High Fearbook. His name is a homophonic play on "Where is he?".
Mr. Where is an Invisible man who constantly wears bandages, glasses and a trenchcoat. He can turn invisible at will, and teaches Drama.
Hexiciah Steam is the creator and father of Robecca Steam. A famous mad scientist and teacher at Monster High, he abruptly disappeared 100 years ago on an expedition into Monster High's catacombs. But there are rumours that he is still alive...
Bartleby Farnum is a shady travelling merchant and showman, who see monsters as little more than freaks to be exploited for profit. He takes the Ghouls to Skull Shores as part of a plot to capture the legendary Beast of Skull Shores.. He appears in Escape From Skull Shores.
Van Hellscream is the main villain of the Monster High Halloween special, "Fright On!", He is a legendary monster hunter, who devises a devious plan to destroy Monster High for good.
Moanatella Ghostier is a famous fashion designer based in Scaris, who invites several promising designers, including Clawdeen Wolf, to her studio for a chance to become her apprentice. But she has a far more sinister motivation for gathering them together... She appears as the villain in Scaris: City of Frights.
Revenant is the Principal of Haunted High, a school for ghosts in the Ghost World. She is constantly trapping her students within the school with detention chains, and seems to have a dark plan in store for them... She is the villain of "Haunted".
Scary Murphy is a fearleading legend and head judge of both the Gloom Beach competition and Monster Mashionals. She instantly took a liking to the potential of the Monster High Fear Squad and its leader, Cleo de Nile, who is a dedicated fan of hers.
The Sheriff of New Salem is the main antagonist of "Ghouls Rule". He leads a manhunt to track down any monsters which could have sneaked into his town, and has a gruesome punishment lined up for them. Unfortunately he's not the most reliable lawman, more interested in sleeping and eating donuts than doing actual police work, though accusations of inadequacy seriously tick him off.
The Skullastic Superintendents are a trio of stoic calacas. They are supposedly in charge of the worldwide monster school network and can decide on the course a school takes or whether it may continue to exist.
Lord Stoker is the Prime Minister of the Vampire Court in Transylvania, who has been charged with finding the missing Vampire Queen. When he is threatened with being removed from his position, he concocts a plot to find a replacement Queen he can control to his own ends... He is the main antagonist of Frights, Camera, Action!.
Superintendant Petra Fied
Petra Fied is a mummy, and the Skullastic Superintendant in charge of the local district. She appears in the third Ghoulfriends Forever book, where she keeps an eye on things when Headmistress Bloodgood is kidnapped.
Scariff Fred Onarrival
Fred Onarrival is a zombie, and the Scariff -Sheriff- of Salem. He appears in the third Ghoulfriends Forever book, where he tries to keep order after the town is panicked from threats by normies. He uses a bullhorn which can translate zombie speak into English to order his deputies around.
CeeCee Thrue is a ghost, and the best photographer in Salem. She appears in the third Ghoulfriends Forever book to takes the students photographs for Picture Day. She acts very much like a rock star diva, wearing leather, demanding others get her coffee, and rudely telling her subjects how to pose for her pictures.
Ygor is Stoker's loyal, but very moronic hunchbacked manservant. Although he is devoted to his master and will do anything Stoker asks, his complete lack of smarts means he often fails in his tasks. He appears in Frights, Camera, Action!.