I would agree that the concept is not new, but "Scooby Doo and the Ghoul School" is probably the one that is most like Monster High because it is all female monster characters.
I was also thinking about the movie "Casper's Scare School," which actually I liked better. And there was this cartoon I used to watch when I was a kid called "Galaxy High" which is again a similar concept but in space with aliens instead of monsters. And then there was the movie "Sky High" which is a school for young superheroes, and "The X-Men" comic which features a school for young mutants. And then there is "Hogwarts" for young wizards. The concept of an exclusive school for unique kids has been used over and over again.
I guess its just Monster High without makeup.
(Is that how to spell makeup?)
first thing I thought of too. a little more wholesome that's for sure, since you don't really see a bunch of middle/elementary school age girls wearing short shorts, minidresses and tiny skirts! I guess Phantasma could be like either Ghoulia or Spectra.
Similar concept different execution. Execution is what counts in my book.
best monster based cartoon ever is a tossup between groovey ghoulies and gravedale high!
I'm surprised no one's used a CAM set to create a doll based on the characters from these cartoons yet, some of them fit very well into the Monster High style. And come on, who wouldn't want a doll of a character like Vinnie Stoker? I would pay good money to take home the Vampire version of the Fonz.
Here's some nice art of the Ghoul School girls as teens.
minus mini skirts and ultra high heels.