However, as the series progressed, the Upper-Rank Three Demon gained a following among fans, largely due to Akaza's principles. Akaza could have exceeded Doma ... Slayer (Image via Ufotable ...

Demon Slayer fans have been ... member of the Twelve Kizuki, Akaza was an exceptionally powerful demon and the fourth strongest in existence after Doma, Kokushibo, and Muzan Kibutsuji.

In Demon Slayer, about five hundred years before Tanjiro's adventure, in the Sengoku Era, the demon known as Kokushibo was still a human Demon Slayer by the name of Michikatsu Tsugikuni.