This zigzagging is annoying me, is it Yusuke or Yūsuke? Omnibender - Talk - Contributions 16:55, August 4, 2011 (UTC)

According to the ending credits, the character's name is Yūsuke (ユウスケ) and he's voiced by someone called Yūsuke (遊助) —ShounenSuki (talk | contribs | translations) 22:17, August 4, 2011 (UTC)
From what I could gather, that's the stage name of the person who voiced the character. It appears it's the same person who sings the theme song of the Blood Prison movie. Omnibender - Talk - Contributions 22:27, August 4, 2011 (UTC)
His Japanese Wikipedia page also corroborates this. —ShounenSuki (talk | contribs | translations) 00:03, August 5, 2011 (UTC)