*Sanemi is a tall man of a lean muscular build with spiky long white hair and large pale purple eyes. His face and body are covered with scars, accrued over his many years of fighting demons. He cuts his hair short somewhere in between the Rehabilitation Training Arc and the Mugen Train Arc. He is usually seen wearing a crazed expression on his face.

He wears a green-tinted version of the standard Demon Slayer uniform, unbuttoned to expose his chest and abs with a white long sleeved shirt over it with the kanji for kill (殺さつ, satsu?) etched on the back, white buckles around his shins and tabi socks with a pair of white zōri with green straps.*