Because you like Kitty Forman in That '70s Show
Indiana Jones is a swashbuckling archeologist who hates snakes, Nazis, and priceless artifacts falling into the wrong hands. See them in Raiders of the Lost Ark.
A good guy who's made some bad choices, Scott Lang is driven in his quest for redemption. See them in Marvel Cinematic Universe.
Armin Arlert was wrong. This world hasn't become hell; it's been hell. He just couldn't see it before. See them in Attack on Titan.
Mikasa Ackerman is a near-perfect soldier who won't break her stone-faced expression whether she's killing foes or protecting loved ones. See them in Attack on Titan.
When the going gets tough, Rick Grimes gets tougher. It's a very useful trait when the world goes to hell. See them in The Walking Dead.
The vampire that killed Zero Kiryu's family also infected him, and he starts to crave blood, much to his horror. See them in Vampire Knight.
Emmet Brickowski is so upbeat it's not even human. Everything is AWESOME! See them in The Lego Movie.
Hayley Stark is a sarcastic 14-year-old with an unusual passion. See them in Hard Candy.
Jack Frost would rather crack a joke or throw a snowball than take anything seriously. See them in Rise of the Guardians.
Even the smallest person can change the course of the world, if he's brave enough. See them in The Lord of the Rings.
It's easy for Brian O'Conner to fake his way into the world of extreme racing because he's been popping cars since his teenage years. See them in The Fast and the Furious.