Because you like James Leer in Wonder Boys

Alex Danvers is a brilliant engineer tasked with alien threats, and one of those aliens is her adopted sister Supergirl. See them in Supergirl.

Greg Heffley will be famous someday, but now he's stuck in class with morons. See them in Diary of a Wimpy Kid.

This master marksman may be a villain, but Deadshot's motives aren't quite as selfish as they seem. See them in DC Extended Universe.

Rupert Giles is a librarian on the outside, fearless evil-fighter on the inside. See them in Buffy the Vampire Slayer.

Blake Henderson is happiest smoking weed on the roof ‘til the end of time, but the real world just has a way of killing his vibe. See them in Workaholics.

Turanga Leela is the daughter of two mutants who live in the sewers below New York City. See them in Futurama.

Community-driven but practical, Calvin Palmer is a natural leader even if he doesn't always see it. See them in Barbershop.

It's certainly easier to get great footage of crimes when you can guarantee they'll happen. See them in Nightcrawler.

Cynical, judgmental, and hipper-than-thou, Enid Coleslaw wears her outsider status like a badge of honor. See them in Ghost World.

Few can match this dwarf when it comes to self-confidence. Gimli is as eager for a good time as he is for a fight. See them in The Lord of the Rings.

A karate master/rocket scientist/squirrel, Sandy Cheeks is the only one who can clean up the other resident's messes in Bikini Bottom. See them in SpongeBob SquarePants.

This android may not have emotions, but Lt. Commander Data's curiosity about humanity is endless. See them in Star Trek: The Next Generation.