Initially rough and ill-tempered, but underneath, he is kind-hearted and has a strong desire to be accepted by his brother, Sanemi. He can be rude and aggressive, especially at the beginning of his introduction, but he becomes more open to cooperation and less poorly-mannered through his interactions with Tanjiro and the others. His initial harshness is influenced by his difficult upbringing and his goal of becoming strong enough to earn his brother's respect. EXTREMELY shy around girls.