Personality. Yoriichi was an extremely stoic man of peace and reverence. He was incredibly humble and proud to see himself like any other human being and no one special. He was adamant that the next generations of demon slayers would surpass the swordsmen of his era, including himself and his brother.Yoriichi was a member of the Demon Slayer corps. He wore Hanafuda earrings like Tanjiro and is revered as the first breath user. He was the creator of the legendary Sun Breathing style, the style