Because you like Hit-Girl in Kick-Ass
Aang is already a master airbender and once he learns to manipulate water, earth, and fire, he'll be truly unbeatable. See them in Avatar: The Last Airbender.
Both brave and foolhardy, Thomas trusts his instincts above all else. See them in The Maze Runner.
Omar Little is a pretty chill guy, as long as you can forgive the stealing and killing people. See them in The Wire.
Quirky and wildly imaginative, Amelie finds joy in the unnoticed things in life and aspires to bring happiness to all. See them in Amelie.
Selfishly taking her father’s place to fight in the Imperial Army, Hua Mulan risks treason if they find out she isn’t who she says she is. See them in Mulan.
Holly Golightly spends so much time trying to be other people's dream girl, she doesn't really know what kind of girl she actually is. See them in Breakfast at Tiffany's.
Shana is a red-haired warrior with a black-and-white worldview. See them in Shakugan no Shana.
SpongeBob SquarePants lives in a pineapple under the sea. Absorbent and yellow and porous is he. See them in SpongeBob SquarePants.
Effortlessly sexy, calm, and collected, Eric Northman is equally at home ripping off heads and flirting with waitresses. See them in True Blood.
Count Olaf is a traveling actor, except he can't act and his homicidal tendencies make finding work pretty difficult. See them in Lemony Snicket's A Series of Unfortunate Events.
This barber doesn't cut hair. Sweeney Todd sends his clients down a chute to be baked into his partner-in-crime's pies. See them in Sweeney Todd: The Demon Barber of Fleet Street.
Dolores Umbridge keeps her villainy hidden (albeit poorly) behind a sheen of sugary pink politeness. See them in Harry Potter Series.