Yoriichi Tsugikuni

Yoriichi Tsugikuni is the creator of Sun Breathing. His older twin brother, Michikatsu, envied his talent and became the demon Kokushibo, whose Moon Breathing derives from Yoriichi's style. Yoriichi nearly killed Muzan Kibutsuji, and in doing so freed the demon Tamayo from Muzan's control. He showed his technique to his friend Sumiyoshi, an ancestor of the Kamado family, whose Hinokami Kagura preserves it, and gave him the Hanafuda earrings that Tanjiro Kamado now wears.