Another character that could possibly match up to Yoriichi is his very own twin brother -Kokushibo, formerly known as Michikatsu Tsugikuni, who gave up his humanity to become a demon so that he ...

Yoriichi Tsugikuni, the most powerful demon slayer, had unparalleled abilities and invented Sun Breathing. Yoriichi's Demon Slayer Mark and Transparent World prowess made him unbeatable in battle ...

Michikatsu constantly tried to surpass Yoriichi's talents and train himself to the point where he perfected his breathing style. However, all his efforts failed because he was inherently different ...