Because you like Ford Prefect in The Hitchhiker's Guide to the Galaxy

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.

Tracy Turnblad's got rhythm, and she's determined to share her dance moves with the world. See them in Hairspray.

An aloof punk rock goddess, Nana Osaki has a surprisingly big heart. See them in Nana.

When the going gets tough, Rick Grimes gets tougher. It's a very useful trait when the world goes to hell. See them in The Walking Dead.

Clary Fray's philosophy: dive into the supernatural underworld first and ask questions later. See them in City of Bones.

Whether he's fighting or flirting, Jace Wayland is all swagger. See them in City of Bones.

Emily Fields has been very guarded, careful of whom she trusts and reveals her secrets to. See them in Pretty Little Liars.

John Bender's interests include marijuana, fighting, and breaking the rules. See them in The Breakfast Club.

Unaware of the fact that he's a toy and made of plastic, Buzz Lightyear is a spaceman on a mission fully of snappy catch phrases. See them in Toy Story.

After training a herd of raptor dinosaurs, everything else is a breeze for Owen Grady. See them in Jurassic World.

The star of every school production since kindergarten and the most popular girl of East High, Sharpay Evans usually gets her way. See them in High School Musical.