Because you like Seto Kaiba in Yu-Gi-Oh!
Matilda Wormwood is so smart, she taught herself how to be psychic. See them in Matilda.
Don't ask the ruthless queen of the Tokyo underworld any questions unless you're fine with losing a limb. See them in Kill Bill vol. 1.
Violet Parr is an angsty teen would love to become even more invisible than her superpowers allow. See them in The Incredibles.
Megamind is searching for purpose in a supervillain life without a superhero to fight. See them in Megamind.
As Marlena Rosenbluth is finding out, confidence in the limelight doesn't always translate to power at home. See them in Water for Elephants.
This is not a democracy. According to Torrance Shipman, it's a "cheerocracy." See them in Bring It On.
Juno MacGuff is hoping sarcasm will get her through the stress of teenage life. And also, teenage pregnancy. See them in Juno.
Maurice Moss is a dedicated IT guy who even talks like a computer. See them in The IT Crowd.
Michaelangelo is an above-ground crime-fighter by night, and a pizza-eating, sewer-dwelling mutant ninja turtle by day. See them in Teenage Mutant Ninja Turtles.
Miss Havisham is the creepiest old rich lady in town. See them in Great Expectations.