He was a former human swordsman, and more interestingly, the brother of Yoriichi Tsugikuni. On turning to a demon named Kokushibo, his sword skills became even more powerful and more refined.

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.

Tanjiro came a long way in Demon Slayer and became a powerful warrior. But was he ever able to surpass Yorichi?