Because you like Sheldon J. Plankton in SpongeBob SquarePants

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.

Krusty The Clown somehow makes life sillier and more somber at the same time. See them in The Simpsons.

For Wreck It Ralph, it's not easy being the bad guy. Especially when you've been designed to destroy but really desire love. See them in Wreck-It Ralph.

Knuckles the Echidna is a 16-year-old red echidna (aka a spiny anteater) and guardian of the ancient Master Emerald. See them in Sonic the Hedgehog.

With her mastery of martial arts and her prodigious building skills, Wyldstyle projects an air of invincibility. But she's not bulletproof. See them in The Lego Movie.

Scooby-Doo always keeps his priorities in order: eat snacks first, solve mysteries later. See them in Scooby-Doo.

A stylish agent, Agent J would rather improvise than play by the rules. See them in Men in Black.

Greg Heffley will be famous someday, but now he's stuck in class with morons. See them in Diary of a Wimpy Kid.

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

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

A cruel pirate, Captain Hook still fancies himself a gentleman. See them in Peter Pan.

Chuckie Finster is a baby afraid of everything from clowns to closets, unless his best friend's by his side. See them in Rugrats.