8 years old, brave and determined like his father. He believes it is his duty to protect those weaker than himself. He's a kind hearted boy who adored his baby brother Senjuro.

2 and a half little toddler. When he isn't glued to his mother's side he is following Kyojuro everywhere. He's more timid than his older brother.

Current Flame Hashira, from a long line of flame Hashira. All Rengoku males (including his sons) look the same, with fire like blonde hair with red tips, big forked black eyebrows, and golden eyes with red around their pupils. He's brave, powerful and in early stages of grieving for his wife's eventual death. He's been neglecting his boys unless Ruka reminds him to check on them.

She is a wise, gentle, and strong-willed woman. As the mother of Kyojuro and Senjuro, her deep moral convictions and her core lesson—that the strong have a sacred duty to protect the weak. She is frail and bedridden, but she never appears weak. She loves her sons and husband and worries what will happen to them when she's gone. She is terminally ill. Ruka has soft black hair that ends in the middle of her back and ruby red eyes.