Finn a.k.a Finn the Human is a boy who is dreaming to be an ultimate hero and monster slayer. He is kinda related to the dude gang, especially Mordecai and Rigby. Some say that Finn is a real life human who got stuck in a coma when he's pet pig Jake died. In cartoony version, Jake is a dog while Finn is a hero.
In Cartoony Version
Born in a small town in the Land of Ooo, Finn is the only one who isn't mutated, unlike his friends, who have powers that came from nuclear waste that hit them during the Mushroom War. He was inspired by his favorite T.V. celebrity Chuck Norris.