Because you like Martha Jones in Doctor Who

Evan is a sensible kid, but being sensible isn't going to help him lose his virginity. See them in Superbad.

WALL-E is a quirky little romantic robot cleaning the wasteland known as Earth. See them in WALL-E.

It's hard enough fighting a war. But it's worse for Commander Shepard, knowing no matter how hard you try, you can't save them all. See them in Mass Effect.

Louise Belcher might be just a kid, but she can manipulate just about anyone with a pulse. All in the name of fun, of course. See them in Bob's Burgers.

Hiro is a free-spirit and remarkable genius who loves bot fighting and problem-solving. See them in Big Hero 6.

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.

Vivian Ward is a no-nonsense working girl with fairy-tale dreams. See them in Pretty Woman.

Joel is a hardened, jaded survivor who keeps finding things to fight for. See them in The Last of Us.

A powerful mob boss, Vito Corleone is always making offers people can't refuse. See them in The Godfather.

The biggest nerd in high school, Bill Haverchuck is the biggest target for bullies. See them in Freaks and Geeks.

This metal-bending mutant may be misaligned with the genetically normal people of the world, but Magneto's got class for days. See them in X-Men Series.