Because you like Princess Zelda in The Legend of Zelda

She's mostly doom and gloom, but you'd get nowhere without Sadness. See them in Inside Out.

Willow Rosenberg may be a witch who can defeat the forces of evil, but she still gets emotional over kittens on the Internet. See them in Buffy the Vampire Slayer.

Rayon is kinder to the world than the world is to her. See them in Dallas Buyers Club.

Chris Miles has run out of cash, luck, and drugs. See them in Skins.

Captain Spock is on a five-year mission exploring the final frontier and boldly going where no man has gone before. See them in Star Trek.

It turns out the girl of your dreams just might have dreams of her own. See them in (500) Days of Summer.

Sookie Stackhouse is a waitress who can read minds and break hearts. See them in True Blood.

World domination and Superman's demise are next on Lex Luthor's to-do list. See them in DC Extended Universe.

Meticulous Arthur is always prepared, but he may not be ready to be the point man in the criminal world of dream sharing. See them in Inception.

Cooper says he used to look up at the sky and wonder at our place in the stars, but now he looks down and worry about our place in the dirt. See them in Interstellar.

Kathryn Merteuil may be a vain sociopath, but you won't be able to look away. See them in Cruel Intentions.

Marv is a brutish but principled thug who'd be right at home on an ancient battlefield. See them in Sin City.