Sana Rengoku is a supporting character of Demon Slayer: Kimetsu no Yaiba. She is the wife of the former and late Flame Hashira, Kyojuro Rengoku. She is loyal, patient, and kind yet a shy young woman who loved her husband deeply. She was supportive and understanding of his duties as a Hashira, and she deeply respected his dedication to protecting people from demons. Even during his absence and the high-stakes mission, Sana remained strong and resilient, even when she was heavily pregnant.