Kotetsu is an energetic and friendly young man. He loves his job of maintaining Yoriichi Zeroshiki's fortune, but unfortunately he hasn't mastered repairs yet. This is what creates uncertainty and fear in him, but after meeting with Tanjiro Kamado, he realizes that he cannot put his hands up. He is often frank and very kind, he tries to help everyone around him. He loves to swear a lot. After the death of his father, he stopped calling other blacksmiths names for a while. During training with