Kokushibo's birth name was Michikatsu Tsugikuni and the twin brother of Yoriichi Tsugikuni, deemed as the most powerful demon slayer ever. Upon awakening his demon slayer mark, Michikatsu feared ...

Fans may have noticed a distinct resemblance between Kokushibo and the legendary demon slayer Yoriichi. On top of that, the mere fact that a demon wields a katana may seem strange to fans.