Kokushibo is Upper Rank One of the Twelve Kizuki, once a human samurai and twin brother of Yoriichi Tsugikuni. Now a powerful demon, he wields a flesh-forged katana and Moon Breathing, embodying both elegance and terror. Cold, disciplined, and prideful, he seeks strength above all while struggling with the remnants of his humanity. Kokushibo wears a purple-and-black hexagonal patterned nagagi kimono over umanori-style hakama pants, which are tied with a white uwa-obi.