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.

During the final arc of Demon Slayer, however, he met quite an awful end. He was put face to face with the most powerful demon after Muzan, Kokushibo. Against him, Muichiro had no chance.