Because you like Laura Roslin in Battlestar Galactica

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.

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.

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

With the ocean breeze behind him and the open seas ahead of him, Jack Dawson feels as if he is king of the world. See them in Titanic.

Gru's more misunderstood than evil, and if he'd rule over the world like he takes care of his three daughters, we'd be in good hands. See them in Despicable Me.

A baker turned reluctant fighter, Peeta Mellark can charm his way out of just about any situation. See them in The Hunger Games .

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

It's hard to tell if Dean Winchester cares more about saving the world or his 1967 Chevy Impala. See them in Supernatural.

Smart and sensitive Sam Winchester tried to escape the family business, but ghosts have a way of haunting you. See them in Supernatural.

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.

Severus Snape is a misanthropic potions teacher with a vindictive streak. See them in Harry Potter Series.

His murderous megalomania aside, Loki is quite charming. Just don't mention his strapping older brother; he's a tad jealous. See them in Marvel Cinematic Universe.