Firstly I would be greatly interested to know what Mbwun appeared like in their minds. And would that image be different for each of them? Since they communicated with fax they could have exchanged sketchs and visual descriptions of their antagonist.
Alright we got descriptions of the monster, but he would look different in all our eyes. The image that may have been imposed on us would have most likely come from the movie, which while having hybrid features that were recogniseable, did not take the appearance described in the book - plus it was nothing like I had imagined from the book.
How about a section in the forums for fan pics (or even fan fiction for that matter ...)? Im sure that some of us wouldn't mind showing the rest what our Mbwun looked like ...
Because I choose to be.