Species

[[Monster High (franchise)|], being a monster-themed franchise, features a huge cast consisting of many different types of monsters (and some humans).

Humans

 * Bartleby Farnum
 * Bekka Madden
 * Brett Redding
 * Candace Carver
 * Chad
 * Clair
 * Jackson Jekyll
 * Haylee
 * Van Hellscream
 * Hexiciah Steam
 * Kipling
 * Lilith Van Hellscream
 * Lilith's goons
 * Lou Zarr

Elementals

 * C.A. Cupid
 * Heath Burns
 * Holt Hyde

Frankenstein monsters

 * Viveka Stein
 * Viktor Stein
 * Frankie Stein

Phantoms

 * Rotter
 * Boolittle
 * Operetta
 * The Phantom of the Opera

Water monsters

 * Lagoona Blue
 * Gillington "Gil" Webber
 * Grimmily Anne McShmiddlebopper
 * Honey Swamp

Skeletons

 * Skelita Calaveras
 * G. Reaper
 * D'Eath
 * Skullastic Superintendents

Zombies

 * Ghoulia Yelps
 * Don of the Dead
 * Sloman "Slo Mo" Mortavitch
 * Neighthan Rot (Hybrid)

Mummies

 * Cleo de Nile
 * Nefera de Nile
 * Ramses de Nile
 * Mummy

Vampires

 * Draculaura
 * Dracula
 * Stoker
 * Elissabat
 * Valentine
 * Gory Fangtell
 * Bram Devein
 * Thad

Ghosts

 * Spectra Vondergeist
 * Johnny Spirit
 * Moanatella Ghostier
 * Sirena Von Boo (Hybrid)
 * Sofeara Gorepola
 * BOO-Lu Cerone

Simulacrums

 * Frankie Stein
 * Hoodude Voodoo
 * Gingerbread boy

Robots

 * Robecca Steam
 * Scarentino

Werewolves

 * Clawdia Wolf
 * Clawd Wolf
 * Clawdeen Wolf
 * Howleen Wolf
 * Romulus
 * Dougey
 * Brocko

Werecats

 * Toralei Stripe
 * Meowlody
 * Purrsephone
 * Catrine DeMew
 * Catty Noir

Sirens

 * Sirena Von Boo (Hybrid)
 * Rider
 * Siren
 * Melody Carver

Dragons

 * Sylphia Flapper
 * Jinafire Long

Centaurs

 * Archer
 * Avea Trotter (Hybrid)

Invisibles

 * Where
 * Verizhe
 * Billy Phaidin
 * Invisi Billy

Arthropods

 * Bonita Femur (Hybrid)
 * Buzz Wingman
 * Wydowna Spider

Plants

 * Venus McFlytrap
 * Crabgrass

Cyclopes

 * Iris Clops
 * Cy Clops
 * Simon Clops
 * Laboratory assistant

Magicians

 * Casta Fierce
 * Scary Murphy
 * Kindergrubber

Gargoyles

 * Rochelle Goyle
 * Garrott DuRoque
 * Gary
 * Rocco
 * Scary Stone

Gorgons

 * Deuce Gorgon
 * Medusa Gorgon
 * Stheno Gorgon
 * Euryale Gorgon
 * Viperine Gorgon

Genies

 * Gigi Grant
 * Whisp

Ogres

 * Lothar
 * Ogrethor

Fae

 * Headless Headmistress Bloodgood
 * Scarah Screams

Other

 * Slug girl
 * Neighthan Rot (Hybrid)
 * Avea Trotter (Hybrid)
 * Bonita Femur (Hybrid)
 * Jackson Jekyll/Holt Hyde
 * Abbey Bominable
 * Andy Beast
 * Clouds
 * Eyera
 * Fawn
 * Twyla
 * Hackington
 * Igor
 * Ygor
 * Irene Maiden
 * Lunch lady
 * Manny Taur
 * Music teacher
 * Perfect Guy
 * Ricky
 * School photographer
 * Tiki