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. He is usually seen wearing an infuriated 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 etched on the back, white buckles around his shins and tabi socks with a pair of white zōri with green straps.