Kokushibo is a tall man of muscular build and pale skin complexion. He possesses long black hair with red tips that he keeps in a ponytail. His most notable feature is the three sets of eyes on his face with yellow irises and red flesh sclera that have black straight lines diverging from each iris. He has red fire shaped demon slayer marks from when he got his demon slayer mark as a human. Kokushibo is 6'3. His physical age is 25, but his chronological age is 480+.