Because you like Gary the Snail in SpongeBob SquarePants
A good-natured and academically minded superhero, Dan Dreiberg can still get his hands dirty in a fight. See them in Watchmen.
Max Fischer is the President of every club who's fighting to save Latin at his school and kiss his teacher. See them in Rushmore.
Fiery, intelligent, and opinionated, Jo March rebels against the restrictions of her era. See them in Little Women.
Seth is short-tempered, crude, and terrible at school, but hopefully there's nothing an epic party can't fix. See them in Superbad.
Genetically and cybernetically enhanced, Gamora was trained from birth to be one of the deadliest women in the galaxy. See them in Marvel Cinematic Universe.
The only thing that can match Rose's looks are her hot temper and free spirit. See them in Titanic.
Django was once a slave. Now that he has a taste of freedom, he understandably wants a full meal. See them in Django Unchained.
Dr. Gordon Freeman is a brilliant physicist is a quiet hero. And given all the violent aliens, he better be. See them in Half-Life.
Hiccup Haddock III may be the only Viking nerd in recorded history. See them in How to Train Your Dragon.
Veronica Sawyer thinks that if you were happy every day of your life you wouldn't be a human being, you'd be a game-show host. See them in Heathers.