Yuuya is a mysterious character at first, indicating nothing of his true personality. He initially appears to be a protective and strong ally, as well as sophisticated and classy. Underneath this façade, however, Yuuya is a sociopath in the truest sense, withholding no understanding or comprehension of morality, affection, social interaction, or the value of life. Yuuya is convinced that only death would reveal a person's true side. He wants to kill anyone he lay his eyes on manipulating them.