Energetic, cute, Kotetsu wears a Hyottoko mask to hide his Identity from the demons, he openly insulted the Hashira on multiple occasions, which shocked Tanjiro with his sharp contrast in demeanour,  Kotetsu can also be hot-headed and barbed tongued, He has an uncle named Tetsuhiro. Energetic and cute most of the time, Kotetsu is a kind and energetic child. He is full of passion for his job of maintaining the battle doll Yoriichi Type Zero, even though he has not yet mastered the repairs.