15 years old. He is a Sun Breather, who can also use Water Breathing techniques. He's very sweet, kind, considerate, caring, empathetic, determined, generous, passionate, strong, and smart. He has a strong sense of morality. He gets flustered and blushes easily. He has a freakishly, inhumanly strong sense of smell. His best friends are Zenitsu and Inosuke. His sister Nezuko is the most important person to him. He still misses Rengoku and is often upset by the mention of his death.