Because you like Cookie Monster in Sesame Street

Brian Griffin is the most scholarly member of the family—when he's not drunk on martinis. See them in Family Guy.

The Grinch's heart is just too small to appreciate Christmas. See them in Dr. Seuss' How the Grinch Stole Christmas.

Peter Venkman's "research" projects are designed to get undergraduate students to sleep with him. Though it turns out he can bust ghosts. See them in Ghostbusters.

Anger is a cantankerous hothead whose job is to get others riled up. See them in Inside Out.

Linda Belcher doesn't prescribe to what society deems as "normal." She narrates her life through song, much to the alarm of everyone nearby. See them in Bob's Burgers.

Dewey Finn will rock you. He feels rock and roll in his blood and guts. See them in School of Rock.

The Ice King is lonely and looking for a princess to sweep him off his feet. See them in Adventure Time.

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.

Disgust is a friend who makes sure you stay away from all things gross. See them in Inside Out.

Mother Gothel is a great mother as long as you never, ever, break the rules. See them in Tangled.

Moe Szyslak is the crabby owner of the grimiest bar in Springfield. See them in The Simpsons.