Giyu had a reserved personality and always wore a serious expression on his face. He was shown to have a strong sense of justice with no tolerance towards those who do not know their own limitations and waste their lives. Although he had a deep hatred towards demons and never hesitated to kill one, he was able to go against the rules of the Demon Extermination Corps by protecting Nezuko Kamado upon realizing that she might be different from the rest of the demons.He was someone who did not talk