i know some are out there as i have the animal and supporting character portfolios. sadly i cant remember where i found them. my assumption if not on these boards or the official MM boards would be from a google search for the portfolio file extension.
edit: and some quick googling gave me these two sites which were linked from the official MM forums -
http://games.groups.yahoo.com/group/herolab/
http://groups.google.com/group/mm2-h...pository?hl=en
the google one has the animals and supporting characters, dont know what the yahoo group has as I didnt join it.