Kokushibo

Kokushibo is an extremely powerful demon from Demon Slayer and holds the rank of upper moon one. Kokushibo possesses a fearsome and imposing appearance. He has long, dark-red hair that flows down to his back, and his eyes are a vivid and piercing red, characteristic of demons in the series. He wears traditional samurai armor with the kanji for "Upper Moon One" emblazoned on his six eyes, signifying his position among the Twelve Kizuki.