Yuuya Mirokuji

A young man who is the main antagonist of the Exclusive Underground Dark Night manga. He is a violent person who enjoys picking fights though he is shown to have a more calm and laidback side. He is not interested in making his creator alter his world being fine with the way he is. He fights using a bokken and can summon a spirit called Hangaku to fight by his side. Though he remains independent at first he came to the aid of Soutas group against Altairs faction several times and eventually joins them. Source: Wikipedia