>>5325309None of the MoMos really have that kind of aesthetic. Closest you could get is one of the huge weapons of sorts on the Goddess types or military types, no huge backpacks or the like without the owner adding them themselves.
I also don't get why you'd want to make a character who's pretty much 80% western property out of a MoMo, much less one who can't transform, but to each their own.
I did some digging on Optune's twitter. Basically, the little impish fellows are scratchbuilt with Gunpla parts and then sprayed, by the looks of it. Pretty fitting for Optune, considering his origins, and pretty good photo results. Too bad nobody could ever buy 'em, though.