Sayo Samonji is a character from the popular online browser game and anime series 'Touken Ranbu.' The series revolves around legendary swords that have taken human form to protect history from being altered. Sayo is depicted as a melancholic and somewhat aloof boy, carrying a deep-seated sadness due to his tragic past. He belongs to the Samonji school of swordsmiths, which is known for producing beautiful yet cursed blades. In the series, Sayo plays a vital role in battling historical revisionists, helping to maintain the course of history as intended. His character adds depth to the narrative with his complex emotions and loyalty.