Because you like Donkey Kong in Donkey Kong
Alex Danvers is a brilliant engineer tasked with alien threats, and one of those aliens is her adopted sister Supergirl. See them in Supergirl.
Juno MacGuff is hoping sarcasm will get her through the stress of teenage life. And also, teenage pregnancy. See them in Juno.
A sadistic sociopath, Lil Z is helping make the City of God slum a Hell on Earth. See them in City of God.
A sarcastic and nosy tomboy, Stephanie Tanner is understandably not crazy about being the middle child. See them in Full House.
A loyal assistant to Nelson and Murdock, Karen Page has a way of finding trouble. See them in Marvel Cinematic Universe.
Evan is a sensible kid, but being sensible isn't going to help him lose his virginity. See them in Superbad.
Experiment 626 was designed for one thing: to destroy everything he touches. See them in Lilo & Stich.
Victor Frankenstein can create life, so he's pretty awesome if he says so himself. See them in Frankenstein.
Garnet is a Crystal Gem who'll protect her friends with her life. See them in Steven Universe.
A plucky 13-year-old with a flair for the dramatic, Kiki is a witch in training. See them in Kiki's Delivery Service.
Norma Bates may look like a harmless housewife, but don't let that fool you. See them in Bates Motel.