Kokushibo as seen in anime (Image via Ufotable) Kokushibo, the Upper Moon One of Twelve Kizuki, appears as a strong opponent in the Infinity Castle series of Demon Slayer. He is the twin brother ...

Demons in Demon Slayer have the insatiable desire to consume ... the most powerful demons and became the Upper-Rank One of the 12 Kizuki, with no one ever being able to replace him.

While he cannot be relied upon in fights, the Demon Slayer Corps leader has incredible foresight, allowing him to make informed predictions regarding Muzan and the Twelve Kizuki's actions.