Hiyori always appears to be bright and cheerful, to the point he has been described as being overly blinding to others. Both his voice and actions are frequently loud and dramatic, and he relishes in garnering attention but will get sulky if ignored. Having been born with royal ancestry, he states that he considers others as below himself in social rank. That, alongside his apparent flippant and selfish behavior, makes him appear as though he doesn't have much interest in others. 