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Daiki never talks to people which has lead people to believe that he is a mute, however he is capable of speech but chooses to communicate with people via a palm pilot he carries around with him writing out what he thinks on it and showing it to the person. When wearing his muzzle, Daiki is in his calm state where he can generally function like a somewhat normal human being however he still acts quite 'off'.
However when the muzzle is off or he is provoked Daiki becomes a psychopathic monster fighting with reckless abandonment and does not stop until the person is either dead or he can no longer move. He uses several kitchen knives which he has stored in a special compartment in the sleeves of his jackets.
Daiki always carries at least two knives hidden in his jacket along with his muzzle on him and a palm pilot.
When growing up, Daiki's parents noticed his psychopathic tendencies from a young age where he took pleasure in killing bugs and small animals. When entering kindergarten he began to bite the other children as hard as he possibly could, which ended with several kids being sent to the emergency room. It was then that he was put into a mental asylum and was forced to wear a muzzle for the start of his treatment. However as they progressed they found he still preferred wearing it as it made him much calmer. While he was in the asylum, he found he had a knack for making simple contraptions that he used to keep himself occupied in his cell by making toys out whatever he could find. Finally after ten years the doctors found that he was rehabilitated and released Daiki provided he was under strict supervision along with him having to take serveral medications every day. His parents however were still too scared of their son and gave him a small apartment close to Maozuka. Meeting Hikaru Utada, he became the closest thing to a friend Daiki had ever had. Wanting to help in his goal to become the top gang, Daiki offered his services to Hikaru.