Webkokushibo never outgrew his envy and resentment of yoriichi, which only led him to live a shallow and empty life. Webyoriichi was the most powerful character in the series, and he was able to defeat both muzan and kokushibo, even when he was not in his prime. In his prime, he. Webyoriichi tsugikuni (継つぎ国くに 縁より壱いち, tsugikuni yoriichi?) is a major supporting character of kimetsu no yaiba. He is a legendary demon slayer who lived nearly 500. Webkokushibo’s defeat is a legitimate relief. After an incredibly long, intense, bloody battle, he finally goes down. And for the audience and the characters, it’s as if a weight has been. Webafter sanemi manages to stitch his wound, he awakens his own demon slayer marks and rejoins the fray as the two now face kokushibo in a 2 on 1 battle. Webkokushibo met yoriichi in his 80s and described him as not being any slower or weaker than he was in his prime with the only reason that kokushibo survived.