Kokushibo is pale-complexed, tall, muscular build. He possesses long, black, spiky hair with red tips tied up in a ponytail. His most noteworthy feature are his six sets of eyes present on his face, and his middle yellow irises consist of the mark of Upper Moon One. Kokushibo from Demon Slayer wears a purple and black patterned nagagi kimono, black umanori-styled hakama pants, and a white uwa-obi. He also has red marks on his forehead, neck, and chin that look like flames.