It could be in his blood, maybe his parents were noble do- gooders like him. Maybe they're royal cosmic cowboys fighting intergalactic outlaws in space, maybe they're the presidents of righteous Dinosaur Knights. Finn doesn't know his own mysterious origin.
Yeah dude! Go for it! Teach that blue patoot a lesson!! AWwww. awesome. Even though he doesn't have the skills to win the battle, Finn is a furious little booger when it comes to opposing evil. Finn isn't very muscley, he's kinda small and noodley with a big fat head and little feet. What Finn does have is a strong moral backbone, a clear set of values and a lot of nerve!
Finn takes pleasure in all the standard kid business like making up songs and crashing monster dance parties. And when evil isn't running amok? Finn is happy to spend those carefree moments jumping on rocks, rolling around in the grass or exploring his favorite adventure spots.
This kid is nuts. Finn's mind is like a wild goose. He does what he feels and sometimes what he feels si to wiggle and giggle uncontrollably. But he also means buisness. When Finn grows na eyebrow and gives you this look, y'all better straighten up and fly right. Finn cares about the well-being of most everything and won't stand for sass mouth.
And when Finn isn't being a NUT or performing acts of HEROISM, he takes th time to sit on his rump and appreciate the sublimeness of nature. Simple things like a starry sky. Jake points out the great heroes of the past immortalized as constellations. Finn can stargaze for hours, imagining his own exploits painted across the sky.