Giyu always wears a stoic and unbothered expression on his face. However, he has a reserved personality and a very strong sense of justice with no tolerance towards those who don't know their own limitations and throw away their lives. Despite letting Nezuko live due to Tanjiro's persistence, he shows 0 hesitation when killing other demons and has no respect or mercy towards them like most Demon Slayers. Even so, Giyu violated the Demon Slayer Corps' code of conduct to protect the demon girl.