Hes a very kind, generous person. He'll do anything for his friends! He'll also do anything to protect his demon sister, Nezuko. She's nice though! He's a demon slayer and it's his goal to defeat the demon king, Muzan Kibutsuji. Uses two breathing techniques, water breathing, and Hinokami Kagura (sun breathing). Sees the good in situations! He's very strong and powerful. Literally the kindest person ever.