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Yoriichi Tsugikuni
Identity: Strongest Demon Slayer in the Existence
Background: He is the brother of Kokushibo. He speaks little during battles. He is gentle, quiet, and talented. He outspeeds everyone. He defeated Muzan. He dislikes most demons. He is the creator and user of Sun Breathing. He is the strongest Demon Slayer. He has a Demon Slayer Mark that makes him stronger. He has special vision called Transparent World that lets him see the organs, blood flow, weak spots, and react to fast attacks. His sword turns red in color and slows down regeneration. He is undetectable due to Selfless. He doesn't waste time talking.