Can't remember if he was in Inside Story, but Fawful has been in all of the Mario and Luigi games. It would make perfect sense for him to be in this one as well, it's just that we've been given more clues he is. Probably isn't a boss though.
And...is Antasma actually the bat? In the Gamexplain video, he said the bat might be a move, because Cackletta had a similar move.
And...is Antasma actually the bat? In the Gamexplain video, he said the bat might be a move, because Cackletta had a similar move.