As long as we are dealing with hypotheticals, I'm going to represent my old stomping grounds of Sporesite.com (R.I.P.) and suggest Petreak's Mentripod. He's a member on this site too even though he hasn't posted in ages, and was included with Hydro, LadyM, and Ovi. (Seeing as I was Third in Command at sporesite, I'd nominate my Gocket as an alternate.)
As for creatures from GS, I would suggest the Sombrerons, Torpals, and Wexxians.