Senjurou Rengoku is a supporting character in the anime series 'Kimetsu no Yaiba' (Demon Slayer). He is the younger brother of Kyojuro Rengoku, the Flame Hashira. Senjurou is a gentle and kind-hearted boy who looks up to his older brother and struggles with his own self-worth, feeling inadequate compared to Kyojuro's strength and determination. Throughout the series, Senjurou's interactions reflect the themes of family, legacy, and perseverance. He plays a key role in showing the personal side of the Rengoku family.