The Upper Rank Demons are the most powerful demons to exist in the Demon Slayer series and are the most evil under Muzan.

A breathing style created after the sun breathing, learn how this was created in the world of Demon Slayer and its relation ...

Demon Slayer is a series ... not killing Muzan and Kokushibo (Image via Ufotable) Yoriichi not killing Muzan and Kokushibo is one of the reasons he is heavily judged. Fans see it as a monumental ...

Demons however, do not need to utilize or develop their own Breathing Techniques as they already possess an ability known as Blood Demon Art ... Kokushibo used to be a powerful demon slayer ...

However, as the series progressed, the Upper-Rank Three Demon gained a following among fans ... kills himself. Kokushibo's reflection indirectly leads to his death in Demon Slayer (Image via ...