Kokushibo

Kokushibou is a member of the Twelve Demon Moons, holding the position of Upper Moon One.

Red Light District Arc
Kokushibou was summoned to a meeting of the Upper Moons, arriving before any of his colleagues. He silently sat facing a wall, only speaking when his presence was acknowledged by the Biwa Demon, and revealing that Kibutsuji Muzan had arrived. Muzan revealed the death of Gyutaro, berating Kokushibou and his fellow Upper Moons for being unable to destroy the Ubuyashiki family and find the Blue Spider Lily. The prominent Upper Moon admitted he had nothing to say in his defense, as Kagaya Ubuyashiki had cleverly hidden himself.

After Akaza brutally destroyed Douma's head, Kokushibou covertly sliced off the former's hand, stating he had gone too far. He explained to Douma that he had not intervened for his benefit, but for the preservation of the hierarchy of the Upper Moon system. He then told Akaza to arrange for a blood battle if he wanted to take Douma's position, asking him if he understood what he was being told. Akaza acknowledged this fact, promising to kill the high-ranking Upper Moon, which Kokushibou wished him luck in before departing.