Because you like Kenny McCormick in South Park
Brian Griffin is the most scholarly member of the family—when he's not drunk on martinis. See them in Family Guy.
Marge Simpson is a mostly happy housewife and subscriber to Sponge and Vacuum Magazine. See them in The Simpsons.
Philip J. Fry accidentally cryogenically froze himself for a millennium. See them in Futurama.
Turanga Leela is the daughter of two mutants who live in the sewers below New York City. See them in Futurama.
Krusty The Clown somehow makes life sillier and more somber at the same time. See them in The Simpsons.
A karate master/rocket scientist/squirrel, Sandy Cheeks is the only one who can clean up the other resident's messes in Bikini Bottom. See them in SpongeBob SquarePants.
Sideshow Bob is a bitter ex-performer who was forced to do inhumane stunts for slapstick comedy. Now he's exacting revenge on his former boss, a clown. See them in The Simpsons.
Roger is a pansexual alcoholic non-human who will happily lie, cheat and steal to get what he wants. See them in American Dad!.
Ahape-shifting dog, Jake is the last man's best friend. See them in Adventure Time.
Greg Heffley will be famous someday, but now he's stuck in class with morons. See them in Diary of a Wimpy Kid.
Shaggy might be a bit of a slacker, but his heart and his stomach are usually in the right place. See them in Scooby-Doo.
Patrick Star enjoys life's simple pleasures because he can't wrap his brain around anything more complicated. See them in SpongeBob SquarePants.