First aired: 1990
Gravedale High was a 1990 cartoon about a human teacher, Max Schneider (Rick Moranis), who gets a job in a school for monsters. The class is made up of the school misfits who, under his tutelage, seem to prevail.
As such we get the school nerd in the form of werewolf Reggie Moonshroud (Barry Gordon), the surfer-dude (and lagoon creature) Gill Waterman (Jackie Earle Haley), the ridiculously rich J.P. Ghastly the III (Frank Welker) who is a Peter Lorre-a-like. Frankenstein’s Monster is parodied as Frankentyke (also Frank Welker) and the invisible man is Sid (Maurice LaMarche) – who happens to be the class clown. The two popular girls are Medusa – also known as Duzer (Kimmy Robertson) – and southern belle and zombie Blanche (Shari Belafonte), and the class has a fat girl in the form of mummy Cleofatra (Ricki Lake).
The imdb page is here.