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 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 & tabi sock