http://youtube.com/watch?v=U4bcarn9CPo While you are thinking of a character that wasn't mentioned - this is a pretty good homer tribute.
Anything to avoid actually getting to bed on time: In some sort of alpha order. I'm adding in Laddie Agnes Skinner Apu Barney Bart Bleeding Gums Murphy Mrs. Bouveaux (Bouvier?) Kent Brockman Bumblebee Man Mr. Burns Cletus Comic Book Guy Crazy Cat Lady Cupcake Kid Disco Stu Drederick Tatum Duffman Eliza Fat Tony Fleet-A-Pita Chef Ned Flanders Rod Flanders Todd Flanders Gabbo Grandpa Frank Grimes Prof. Frink Handsome Pete (he dances for nickels) Hans Moleman Dr. Hibbert Homer Inanimate Carbon Rod Itchy Jimbo Johnny Tightlips Karl Mrs. Krabapple Krusty Laddie Lester Lionel Hutz Lisa Lou Lunchlady Doris Maggie Manjula Nahasapeemapetilan Marge Mayor Quimby Troy McClure Milhouse Mona Simpson Mr. Sparkle (Fishbulb) Lindsay Naegle Nelson Pie Man Otto Patty Pinchy Poochie Principal Skinner Rabbi Hman Krustofski Rainier Wolfcastle Reverend Lovejoy Martin Roger Meyers Jr. Dr. Nick Riviera Santa’s Little Helper Scratchy Sea Captain Senor Ding-Dong Sherri and Terri Sherri Bobbins Sideshow Bob Sideshow Mel Smithers Snake Snowball 1 Spider Pig Stampy Supernintendo Chalmers Uncle Herb Ralph Wiggum Chief Wiggum Sarah Wiggum Willy
Gil Gunderson AKA Old Gil This character was inspired by Jack Lemmon's performance in Glengarry Glen Ross.
Roy... the extra kid brought on to make fun of how shows introduce extra characters to boost ratings.. during the Itchy Scratchy and Poochie show... finding a picture of him though is nearly impossible...