Because you like Gilderoy Lockhart in Harry Potter Series

Carl Fredricksen is a crotchety old man who may just have it in him to take one last, great adventure. See them in Up.

He's a troubled insomniac in search of a moment to rest and a meaning to his existence. See them in Fight Club.

If you need her, Lisa Simpson will be in her room with her saxophone and a good book. See them in The Simpsons.

Pro tip: the psych ward is not the best place to find a mentor like Lisa Rowe. See them in Girl, Interrupted.

Ellen Ripley defines the word "badass." When she's not leading her crew on an interstellar voyage, she's slaying terrifying creatures. See them in Alien.

Accessing more than 10 percent of your brain can do strange things to anyone, and Lucy is Exhibit A. See them in Lucy.

Though she can seamlessly flit between glamorous identities, Sydney Prosser is more vulnerable than she pretends to be. See them in American Hustle.

Trevor Phillips is an unpredictable maniac who tortures people for no reason. See them in Grand Theft Series.

The last war left his economy devastated, and now Germany is engaged in another war and stuck with two barely trained allies for help. See them in Axis Powers Hetalia.

Hiccup Haddock III may be the only Viking nerd in recorded history. See them in How to Train Your Dragon.

While Alan Garner is loyal to his new friends, his efforts to help them often do more harm than good. See them in The Hangover.

When a half-breed breaks the rules, John Constantine deports them straight back to hell. He's trying to buy his way into heaven. See them in Constantine.