Not at the moment. And his appearance wasn't planned at all. I had the boys in a random abandoned house, then started wondering why it'd be preserved like that, and Herbert popped up and started telling me the story while ogling Erik and Raoul. No bloody idea why, either.

(Incidentally, he plays the harp. Rather well. He once used the music to drive someone mad, because he'd made a bet that even the bloodiest soul could be moved to tears.)