Isamu initially gives the impression of that of a lazy and smarmy individual, with a laid-back and cocky nature.

Isamu is a lanky teenager of average height with pale skin, gray eyes and neck-length black hair that is parted at the center with locks of hair framing either side of his face. He wears a black newsboy cap with a matching vest over a simple white T-shirt, and over the vest he sports an unbuttoned black suit jacket and his blue jeans have cuts in them. 