Because you like Donna Carmichael in Mamma Mia!

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

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

This thrill-seeking driver lives by a very particular moral code. He stands by his word and he's loyal to a fault. See them in Drive.

A powerful mob boss, Vito Corleone is always making offers people can't refuse. See them in The Godfather.

Alison DiLaurentis believes you're always better off with a really good lie. See them in Pretty Little Liars.

Shaun is used to being lazy. And now, you're asking him to fight for his life? See them in Shaun of the Dead.

Dory is more than a little forgetful, but she'll always remember to have your back. See them in Finding Nemo.

It’s usually the good-looking, charismatic, play-by-their-own-rules types that get everyone into trouble, and Tyler Durden is Exhibit A. See them in Fight Club.

Sabriel is smart enough to understand the dangers that await her and brave enough to face them anyway. See them in Abhorsen Series.

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.

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

Daring on a bike but haunted in his personal life, even Johnny Blaze isn't fast enough to outride his past. See them in Ghost Rider.