Because you like Daniel LaRusso in The Karate Kid
Bella Swan thinks of it as her job to help her parents and protect her friends, even though it often ends up the other way around. See them in Twilight.
A daring hacker, Trinity is one of the few rebels who escaped the Matrix, a simulation in which most of humanity is enslaved. See them in The Matrix.
Ramona Flowers is a delivery girl who's been through her fair share of bad breakups. Super-bad breakups! See them in Scott Pilgrim vs. the World.
With his own ship, Peter Quill calls his own shots, and gets to fly from planet to planet blasting '70s pop hits and picking up alien chicks. See them in Marvel Cinematic Universe.
Greenpeace? No, this brave eco-terrorist is waging Greenwar. See them in Final Fantasy Series.
Nick Miller might not have a bank account, but he defintely has a lot of love to give. See them in New Girl.
Hawkeye Pierce is a Devil-may-care Army doc who'd have the Devil laughing and drinking in five minutes flat. See them in M*A*S*H.
Sabriel is smart enough to understand the dangers that await her and brave enough to face them anyway. See them in Abhorsen Series.
Though she can seamlessly flit between glamorous identities, Sydney Prosser is more vulnerable than she pretends to be. See them in American Hustle.
A 100-plus-year-old who looks like a dreamy teenager, Edward Cullen warns girls to avoid him, which makes them want him even more. See them in Twilight.
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.
