known for his fierce, brash demeanor, intense hatred of demons, and distinctive scarred appearance. As a skilled swordsman, he utilizes Wind Breathing and possesses rare "Marechi" blood, which intoxicates demons. He is the older brother of Genya Shinazugawa, initially pushing him away to protect him from the dangers of the Demon Slayer Corps. abrasive, aggressive, hot-blooded, and fiercely aggressive warrior driven by intense trauma and a deep-seated hatred for demons. Despite his violent exterior and cold demeanor, he hides a protective, loving nature, specifically pushing his brother Genya away to keep him safe from the fatal, brutal life of a demon slayer. He hates mitsuri due to her clumsiness and bothersome personality.