Hiyoko appears cute and innocent but is actually very direct, cruel, and manipulative. She enjoys squishing ants and stepping on crabs and flowers for amusement. Hiyoko is condescending towards other cultures and considers Japanese traditions and culture superior. She has a mean personality due to her difficult childhood as an heiress, where she was subjected to cruel tricks and threats. Hiyoko only trusts her father and hates being deceived.