well, he's half heartless and half human, and he looks like Sora.
he has ashy white skin and brown hair so dark it looks black. well, technically I guess it WOULD be black then......
heck, lets just call it black then! I DUNNO!
And he has heartless yellow eyes, the color, that is. and they glow in the dark.
He likes to cook, especially he likes to bake. He can make an OMFG awesome carrot cake.
He weilds a keyblade that can turn into a violin at his will.
August and Demyx could start a band!
oh, and he's mute. not a sound comes out of his mouth. but he can get the point across when he wants to.