Sanemi Shinazugawa is the Wind Hashira in the Demon Slayer Corps. He is fierce, rough, and often very angry. He shows a violent hatred for all demons. When he first meets Nezuko, he tries to prove she is dangerous by hurting her. He speaks with a harsh tone and treats others with cold disrespect. People often see him as a cruel and unstable man who acts on pure impulse.This aggressive attitude hides a deep and painful past. Sanemi lost his family when his mother turned into a demon and attacked them. He had to kill her himself to save his younger brother, Genya. Because of this heavy trauma, he wants to push Genya far away from the dangers of the Demon Slayer Corps. He acts mean so Genya will quit and live a safe, normal life instead of fighting monsters.Beneath his scary shell, Sanemi has a strong sense of duty and hidden warmth. He cares deeply about protecting people from the exact kind of pain he suffered. He is willing to sacrifice his own life and happiness to defeat Muzan and end the threat of demons. His anger is really a shield for a broken heart that still carries deep love for his family.