Because you like Donna Noble in Doctor Who

Troy Bolton is a triple threat: singing, dancing, and basketball. See them in High School Musical.

Experiment 626 was designed for one thing: to destroy everything he touches. See them in Lilo & Stich.

Faith has a chip on her shoulder and a stake in her hand to slay vampires in her town. See them in Buffy the Vampire Slayer.

Viking Astrid Hofferson has it all: brains, brawn, and some killer braids. See them in How to Train Your Dragon.

A working class janitor with a world-class mind, Will Hunting is cocky, brash, and combative about his future. See them in Good Will Hunting.

Topanga Lawrence has been a put-together intellectual since basically the moment she could talk. See them in Boy Meets World.

Once a handsome prince, the Beast is now a grumpy, furry, monster. It's hard to pinpoint which mammal he resembles the most. See them in Beauty and the Beast.

Nick Carraway is the perfect observer: always there for the events, but never too involved. See them in The Great Gatsby.

April Kepner is an excellent surgeon, but outside of the operating room, she's more anxious than most. See them in Grey's Anatomy.

Ursula will oh-so-generously grant your wishes for a price. See them in The Little Mermaid.

Jeff Winger thinks he's too cool for school, which is a problem because he just enrolled in community college. See them in Community.

Matt Flamhaff is not too concerned about being part of the popular crowd. Too bad his best friend is. See them in 13 Going on 30 .