Because you like Lily Aldrin in How I Met Your Mother

Even the smallest person can change the course of the world, if he's brave enough. See them in The Lord of the Rings.

An underdog with nothing left to lose, Donnie Creed has everything to prove. See them in Creed.

A good-natured and academically minded superhero, Dan Dreiberg can still get his hands dirty in a fight. See them in Watchmen.

Carl Gallagher is a budding psychopath fascinated with rule breaking. See them in Shameless.

This is not a democracy. According to Torrance Shipman, it's a "cheerocracy." See them in Bring It On.

Cutting ties with her con-artist friends, Sarah Manning is creating a better life for her daughter by taking on the identity of the deceased Beth. See them in Orphan Black.

A premier member of the leather cat-suit club, Selene can chill you with a stony look, or ice you with her ninja moves. See them in Underworld.

For someone who swears she doesn't care for anyone, MJ Jones spends a lot of time observing her classmate Peter Parker. See them in Marvel Cinematic Universe.

Charming and enigmatic, Amy Dunne takes her love for puzzles to a cunning new level. See them in Gone Girl.

Jack Twist is a playful free-spirit, but he isn't afraid to fight for what he wants. See them in Brokeback Mountain.

Told her son will one day save the world, Sarah Connor dedicates her life to training him to do just that. See them in The Terminator.