Because you like Gideon Gleeful in Gravity Falls

Daria Morgendorffer is so defensive that she actively works to make people dislike her so that she don't feel bad when they do. See them in Daria.

Yukiteru is a reclusive observer who would rather watch life go by than participate in it. See them in The Future Diary.

Although Thomas Sharpe is an English baronet, he doesn't have a Shilling to his name. He's in America to sell his invention and marry rich. See them in Crimson Peak.

Sally Albright is high maintenance who she thinks she's low maintenance. But she's still worth it. See them in When Harry Met Sally....

Foul mouthed and disturbingly comfortable with violence, Hit-Girl is a precocious assassin who doesn't need anyone's protection. See them in Kick-Ass.

Nadja was feminasty before it was cool. See them in What We Do In The Shadows.

Tarzan is walking the line between human and animal. Good thing he has excellent balance. See them in Tarzan.

His superiority complex coupled with his bitter desire for revenge makes Vegeta a formidable foe. See them in Dragon Ball Z.

Helpful and courageous, Kirby is a playful, fun-loving little guy. See them in Kirby.

Irene Adler has to use both her brains and her body to survive. Luckily, she's usually the most brilliant person in the room. See them in Sherlock.

Lelouch vi Britannia is a high school student by day, masked destroyer of tyrannical empires by night. See them in Code Geass.

Howard Wolowitz is an engineer whose serious mommy issues somehow haven't dimmed his confidence. See them in The Big Bang Theory.