Kai Okana is the chosen avatar of the Element Wind. While working on a hunt, he usually likes to keep his wind powers a secret, and doesn't use them. But in dire situations he can do one of two things..

If he's shot up, beaten to a near pulp, near death, his demon, Drake, takes advantage of Kai's weakness and goes on a slaughtering rampage, using Kai's body like a puppet (thus physical feats aren't a matter of remaining strength, but how much strength the demon has inside him).

Or, if a feat of amazing strength, agility, or speed needs to be done (get a bomb to the outside of the city before it explodes) he can call upon the Element Wind to grant him glorious powers fitting the element.

This was a proportion sketch done while listening to Sweetness by Jimmy Eats World, then it turned into an expression doodling, and then I turned Kai into a bishounen/super saiyan, SHUT UP, he's sexy ok?