Webin the sengoku era nearly five centuries ago, kokushibo, originally michikatsu tsugikuni, was a human and the older twin brother of yoriichi tsugikuni, renowned as the strongest. Webkokushibo made a brief appearance in demon slayer season 3, but the impact he left was unparalleled. The aura he possessed was worthy of an upper moon. Webborn in the sengoku period, kokushibo's birth name was michikatsu tsugikuni. At the time that he and his brother yoriicchi were born, twins were considered a bad omen, and. Webkokushibo is actually not the character’s real name, which is tsugikuni michikatsu. Kokushibo means black death, a name befitting of the character that. Webbefore he became a demon, he was actually a human named michikatsu tsugikuni, who happened to be a demon slayer. He is the twin brother of yoriichi. Webfrustrated from being unable to surpass his brother, as well as fearing the fated death of those who awakened their demon slayer marks, michikatsu was persuaded by muzan. Webin his human days, kokushibo was known by the name michikatsu tsugikuni. He is the twin brother of yoriichi tsugikuni, the legendary demon slayer. Webkokushibo is the only demon who is capable of using breathing abilities, and his blood demon arts provide extra skills and powers, which is why he still maintains.
