I think they may be their own species. Although it is fun to think of them as the LEGO creators, and it almost makes sense, I just don’t know if its logical. Frankly, I’m not sure how advanced their powers are. I think most of their creation ability comes from their technology. Think about it: they had the, the knowledge, the material, (and the money ) to build a 40 million foot tall robot, program up a spirit to control it, build thousands of high-tech humanoid creatures, and program spirits for all of them... also to build the Red Star, the Battera, etc. I think these are all signs of a high level of technology and scientific knowledge. Also, in the comic “All our sins remembered”, showing them analyzing Energized Protodermis, we see machinery there too.