Senjuro Rengoku is a supporting character in the anime series Kimetsu no Yaiba, also known as Demon Slayer. He is the younger brother of Kyojuro Rengoku, the Flame Hashira. Unlike his brother, Senjuro lacks the talent and inclination to become a Demon Slayer. Despite this, he deeply admires Kyojuro and strives to support him and their family's legacy. Senjuro is gentle and earnest, often seen dealing with his own insecurities while trying to live up to his brother's expectations. Throughout the series, he offers emotional support and symbolizes the familial bonds that are central to the storyline.