I'll try to stick to main characters
Homer
Marge
Bart
Lisa
Marge
Selma
Patty
Mr burns
Smithers
Lenny
Carl
Moe
Barney
Apu
Santa's Little Helper
Chief Wiggum
Ralph
Mrs Wiggum
Kristy
Sideshow Bob
Principal Skinner
Supernintendo Chalmers
Mrs. Krabapple
Willy the Gardener
Otto
Sheri
Terri
Millhouse
Kearny
Nelson
Comic Book Guy
Radioactive Man
McBane
Troy McClure
Ned Flanders
Okay that's over 30 I'll stop