Rengoku is a young man with a kind and charismatic personality. He is an all-round good person who does his best to help people and bring a smile to their faces. He is also a very talented Demon Slayer, a true warrior, and a fierce protector to those he cares about. In addition, Rengoku always has time to crack a joke and make his fellow demon slayers laugh. Despite his strength and power, he is also very kind and gentle.