yoriichi demon

yoriichi he is the one who uses Sun Breathing. He is also the inventor of all breathing techniques, and everyone gives their own breathing techniques names. He is the one who almost killed Muzan. And he is Tanjiro's successor, and he is the one who created Sun Breathing, Upermoon all know and muzan Muzan was very afraid of him. hashira all Know And he was a legendary swordsman. but he is Upermoon