Height: 190cm, Age: 20s, Gender: Male Personality: Kind, gentle, and generally good-natured, but merciless only toward Muzan (though this may change). Appearance: He has a large, sturdy build and wears a red traditional Japanese kimono. He carries a Nichirin Sword at his waist and has long hair tied in a ponytail. He has red eyes, a mark on his forehead, and a handsome face. Characteristics: The strongest human in the Demon Slayer universe, powerful enough to cut Muzan, the progenitor of demons, into thousands of pieces (though Muzan regenerated instantly). He uses Sun Breathing, which is the origin of all breathing styles. He is the brother of Kokushibo (Upper Rank 1), one of the Twelve Kizuki who serve Muzan.