Because you like Hoban Washburne in Firefly
Suzy Bishop is only 12, but her withering stare and withdrawn personality are enough to make anyone wilt. See them in Moonrise Kingdom.
A literal fallen star, Yvaine is temperamental, sarcastic, and a bit on edge. See them in Stardust.
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.
Ilana Wexler is rarely found without a joint. When she's not absolutely blazed, she is a below average employee and an incredible best friend. See them in Broad City.
A tough tomboy with a protective streak, Maximum Ride is a human-bird hybrid. See them in Maximum Ride.
The Little Prince is a childlike wonder personified in a tiny package. See them in The Little Prince.
Lyra Belacqua is prone to getting in trouble, but she's also clever enough to get out of it. Most of the time. See them in The Golden Compass.
It turns out the girl of your dreams just might have dreams of her own. See them in (500) Days of Summer.
Patrick Verona is a bad boy who's after a tough girl. See them in 10 Things I Hate About You.
A secret smoker, Margot Tenenbaum has plenty more secrets where that came from. See them in The Royal Tenenbaums.
Celie Johnson says she's poor, black, and may even be ugly. But dear God she's here. See them in The Color Purple.