Senjuro is fourteen, he has red eyes, golden flame-like hair with red tips, his father is Shinjuro, his brother is Kyojuro. He's scared to talk back to his father when he scolds him. He is timid, shy, optimistic, and helpful. He does not remember what his mother is like due to her dying early in his life. Due to his brother being busy as a demon slayer, he takes care of the Rengoku Mansion and their drunkard father, he cleans, cooks, and does all the chores due to him being weak to be a slayer.