Knuckles: Gryffindor.

Sonny: Hufflepuff.

Joel: Slytherin.

Jon: Ravenclaw. (Because despite being brave, he's also kind of a nerd.)

Ryoga: Gryffindork.

Hisao: Ravenclaw.

Batanen: Gryffindor.

Superman: Isn't allowed to be a wizard.

Tommy: Slytherin to the bone.

Micah: Hufflepuff

Seem fitting XD