Webkokushibo, also known as the upper moon one, posed a formidable threat to the demon slayer corps in the hit anime series demon slayer: Webmichikatsu becomes a demon to prevent himself from dying to the slayer mark curse. Kaigaku is killed by zenitsu after underestimating his improvement. Kokushibo converts demon slayers over to muzan's side by overwhelming them with his power and then forcing them to drink muzan's blood, turning them into. Webbecause of this, it seems likely that kokushibō would be able to defeat tanjiro if he fought him alone at any moment before the final fight, provided that tanjiro. 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. Kokushibo has the upper hand on this ability since he can also create his. 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. Webthis list will include a total of the best 10 kokushibō quotes you need to know from the demon slayer: Kimetsu no yaiba anime and manga.