Webkokushibo is one of only two known demon slayers who became demons later in life. His past is a dark and rather sad one weighed down by jealousy and an. Webupper moon one kokushibo maintains the highest rank among the 12 kazuki, so it is apparent that he is the most powerful among all the other demons. Webyoriichi was a human with extraordinary swordmanship and had the most powerful breathing style that could even take down muzan, while kokushibo was originally a. Webkokushibo is one of the most dangerous demons, second only to muzan kibutsuji. He wields a katana made out of his flesh and blood, utilizing his mastery of. Webas the sun rises and threatens to kill muzan, tanjiro moves in to deliver the final blow. However, he is fatally wounded. Webkaigaku surrendered to kokushibo and accepted muzan's blood to become a demon. After the death of his brother, kokushibo continued on to devour humans and hunt down. 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. Webthe biggest villain of the series, muzan kibutsuji, is a figure clad in mystery. Fans have a lot of questions about where he came from, his motivations, and the source. Webmuzan revealed the death of gyutaro, berating kokushibo and his fellow upper ranks for being unable to destroy the ubuyashiki family and failing to find the blue spider lily.
