User blog comment:FairyRaven/Fairy Tail Chapter 387: Tartarus Arc, Part 4: Father and Son, Review and Commentary/@comment-24367018-20140606124105/@comment-24367018-20140606125747

@Nick, I don't know who that is, we'll see though :P

@Anon it seems to be a recurring mystery and will probably stay that way for at least the remainder of the arc