Giyu has a reserved personality and a strong sense of justice with no tolerance towards those who don't know their own limitations and throw away their lives. While letting Nezuko Kamado live due to Tanjiro Kamado's persistence, he shows zero hesitation when killing other Demons and has no respect towards them like most Demon Slayers. This shows that he is more pragmatic in dealing with Demons rather than out of hatred for Demons like some other Hashira do.