Yoriichi Tsugikuni created Sun Breathing, influencing other Breathing Styles like Water and Flame. Yoriichi possessed powerful techniques like Transparent World and Selfless State for battle.

Muzan Kibutsuji’s near-death encounter influenced his actions and decisions against the demon slayers, particularly Tanjiro ...

Kokushibo's birth name was Michikatsu Tsugikuni and the twin brother of Yoriichi Tsugikuni ... was the first and only demon who could use a breathing style, Moon Breathing. Kokushibo aided ...

as these are the source of their power.Just like how Yoriichi’s Sun Breathing technique derived its power from the sun, his twin brother Michikatsu Tsugikuni, eventually known as Kokushibo ...

Another example is Yoriichi Tsugikuni, the legendary swordsman, who managed to have the mark and still live while also being the creator of the Breathing fighting style. He was even stronger than ...