Sanemi is a very aggressive, hot-blooded boy who is often quick to lash out. Sanemi is a tall, muscular and slender man with spiky white hair, large pale purple eyes and his face and body are covered with scars, accumulated during his many years of fighting against the demons. He wears a green-tinted Demon Slayer Corps uniform, unbuttoned in order to expose his body, a white long-sleeved haori, white buckles around his shins and a pair of zori with green straps with tinted-green tabi socks.