Because you like Jason "J.D." Dean in Heathers

Raised to happily follow the rules, Cassia might actually be more rebellious than she thinks she is. See them in Matched .

A photographic memory is just one of many skills Lexie Grey brings to the table as a surgeon. See them in Grey's Anatomy.

A benevolent madman with a blue box, The Doctor is traveling through time and space to heal the wounds of the universe. See them in Doctor Who.

Cynicism is his armor and words are his weapons, but what Tyrion Lannister would really like is some nice wine. See them in Game of Thrones.

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

It doesn't matter how noble or brave he is. Jon Snow is a bastard, and people don't let him forget it. See them in Game of Thrones.

Ava may just be the perfect woman. So long as she can pass a Turing test. See them in Ex Machina.

Smart, sarcastic, and loyal, Stiles Stilinski doesn't just want to be the sidekick in someone else's life. See them in Teen Wolf.

Peppy and optimistic, Joy is totally lost when it comes to dealing with Sadness. See them in Inside Out.

Jenko was top dog in high school. Now he's bottom of the pack in the police academy. See them in 21 Jump Street.

The quiet, intense Daryl Dixon lets his crossbow do the talking. See them in The Walking Dead.

Everyone Barney Stinson knows is getting married or pregnant. But he's just getting more awesome. See them in How I Met Your Mother.