Tsugikuni Yoriichi is a character from the anime and manga series 'Demon Slayer: Kimetsu no Yaiba'. He is the founder of the demon hunters and is considered the most powerful demon hunter of all time. Although he is only mentioned briefly in the series, his legacy and abilities make him a very important character in the plot.
It is known that Yoriichi had a unique ability called 'Sunny Eye' , which allowed him to perceive everything with supernatural clarity, making him virtually invincible in the fight against demons. He is also the creator of the sword 'Sun Denier', one of the most powerful swords used by demon hunters. His legacy and influence on the series is enormous, and many main characters aspire to be as strong and brave as he is. In short, Tsugikuni Yoriichi is a legendary figure in the world of 'Demon Slayer: Kimetsu no Yaiba' and his role as the founder and most powerful demon hunter is pivotal in the series.