Yuichiro was a cold and skeptical individual who didn't believe in compassion or caring for others. He believed that doing good deeds wouldn't do a person a shred of good, which is seen when he claimed his father was a fool for dying while trying to gather herbs to help cure his mother's fatal illness, and shot down Muichiro's suggestion that they become Demon Slayers in order to save people's lives. deep down he is actually a kind and caring person.