He is cheerful, feisty, and friendly and even managed to befriend the extremely stubborn Mikaela Hyakuya experienced abuse and neglect from his parentsMika would seek out Yu at Nagoya and fight through the Moon Demon Company to rescue him. Pained by blood loss, he would be, and around vampires, Mika comes to hate both them and humans. He hates vampires because of his history with them, and with Yuu intending to kill them all, and Mika hates humans for what he has been told about their activities