Brain Unglaus is a mercenary and the leader of the Mercenary group called the "Death Spreading Brigade". Brain is arrogant and supremely confident in his skills. Part of this stemmed from his incredible talent with the sword. As he was so exceptional that he was able to match Gazef Stronoff with very little preparation or training. Brain is somewhat amoral and willing to take on any job, so long as he can test his sword skills on a human opponent in preparation for his next duel with Gazef.