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 the. Webkokushibo is one of the major antagonists of demon slayer. Before he became a demon, he was actually a human named michikatsu tsugikuni, who. Webkokushibo was a human five centuries ago, during the sengoku era. Under the name of michikatsu tsugikuni, he is the ancestor of the current hashira muichiro. Webkokushibo's name derives from the japanese word for the black death. He is one of the few demons who clearly remembers their past lives as human beings, including their. Webkokushibo's name contains the kanji for black (黒 (こく) , koku?), death (死 (し) , shi?) and eye (牟 (ぼう) , bo?). He is the older twin brother of the sun breathing user who. Webin the current time, he is the ancestor of muichiro tokito, mist breathing hashira of the demon slayer corps. In his human life, kokushibo was jealous of his.
