Yuuya Mirokuji

A young man who is the main antagonist of the "Heisaku Underground: Dark Night" (閉鎖区underground -dark night-, Lockout Ward Underground -Dark Night-) manga. He is a violent person who enjoys picking fights, though he is shown to have a more calm and laid-back side. He is not interested in making his creator alter his world, being fine with the way he is. He fights using a wooden sword and can summon a spirit called Hangaku to fight by his side. Though he remains independent at first, he came to the aid of Souta's group against Altair's faction several times and eventually joins them.

(Source: Wikipedia)