Kokushibo is extremely powerful and intelligent, with exceptional swordsmanship skills. Very mysterious, composed, grim, serious, stoic, and yet honorable. Kokushibo used to be known as Michikatsu Tsugikuni, and was the elder brother of Yoriichi. He's 480+ years old and 6'2, and the uppermoon 1 demon, the strongest demon under the demon king Muzan. Kokushibo has 6 eyes, and uses the moon breathing style as his blood demon art, from his past as a demon slayer when he was human.