Yoriichi invented breathing styles, including. Webyoriichi tsugikuni is a legendary demon slayer who created the sun breathing style and fought muzan kibutsuji. He is the twin brother of kokushibo, the. Webyoriichi tsugikuni was the most powerful demon slayer and the inventor of the sun breathing style. Learn about his birth mark, red sword, transparent world and. Webyoriichi is the strongest demon slayer ever, the inventor of breathing styles, and the twin brother of michikatsu tsugikuni. Learn about his background,. Yoriichi was born with his mark, granting superhuman talents from birth. The mark allowed him to fight with untraceable speed,. Weblearn how demon slayer marks are symbols of strength and heritage that manifest on slayers who push themselves to the limit. Find out why tanjiro is the key to. Webhowever, yoriichi was born with a unique trait, known as the “mark,” which made him extraordinarily powerful. This mark, which is a pattern resembling a sun on his forehead,. Webyoriichi’s legacy has lived on through demon slayer marks, even so long after his legendary deeds. Bright red nichirin sword. The demon slayer mark is a powerful.