Because you like Donna Noble in Doctor Who

V is a violent anarchist with literally nothing left to lose. But, he might have a point. See them in V for Vendetta.

Beware! Anton Chigurh carries a coin with him, which he forces his victims to flip to decide whether they will live or die. See them in No Country for Old Men.

Sheldon Cooper is brilliant in every way except, well, interacting with any human being. See them in The Big Bang Theory.

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

Socialite-turned-runaway-turned-waitress, Rachel Green is the legendary story of riches to rags, trying to work her way up again with the help of her friends. See them in Friends.

The adventurous daughter of Port Royal's governor, Elizabeth Swann would rather conspire with pirates than sit pretty in her corset. See them in Pirates of the Caribbean: the Curse of the Black Pearl.

He's an eccentric pirate making it up as he goes along. He's Jack Sparrow, savvy? See them in Pirates of the Caribbean: the Curse of the Black Pearl.

Given his ability to wrench street signs from the ground, Shizuo Heiwajima is a useful one to have in dangerous Ikekuburo. See them in Durarara!!.

Jax Teller can be cool or vengeful, calm or wrathful, depending on the situation. See them in Sons of Anarchy.

Optimus Prime is a shapeshifting sentient robot leading a team of robots to stop evil from taking over. See them in Transformers.

Known as the "rat king" of Paddy's Pub, bartender Charlie Kelly spends most of his time drinking at his bar instead of serving drinks to customers. See them in It's Always Sunny in Philadelphia .

A born psychopath, don't expect Michael Myers to understand the difference between right and wrong. See them in Halloween.