User blog comment:Kogath/Monster Hunter Stories Discussion/@comment-27664639-20160526155145/@comment-5167887-20160526185846

I noticed as well a bunch of alternate color palettes for some of the monsters, namely that orange-striped Tigrex and the Nargacuga with olive bladewings and blood-red wing membranes.

I don't think it is a major thing however, IMO that is most likely a sort of ally monster customization.