Any spiffy new abilities you'd like added?
Not directly.
For me the attraction of something like giant space hamsters is just wallowing in the absurdity and crafting add-ons to the base concept, like your wrasslin' GSH's, and then my suggestion of lucha GSH's.
So after whatever variants you make, I'd look at things like tagging in GSH's as animal companions, (miniatures as) familiar, Habitrail inspired wondrous architecture (or PF downtime room components or kingdom builder elements, and similar insanity.
Of course that turns it into more of a general project than a one-off.
So . . . whatever you've got, I'll just have fun with.