That's "Dobo" from the Arms Micron line, it was one of the Gacha capsule toys. It doesn't really belong to any figure, but it can be used with any of the larger Arms Micron figures or a 5mm port.
I figured this wouldn't take long, but I admit I'm impressed. I don't collect any of those. Looks like my son will get it.
Thanks.
sometimes the knowledge that people have on these Boards (including this very addicting habit of collecting toys) astounds me. I sometimes surprise myself with the amount of "useless facts" (how my wife sometimes calls it) I have floating around in my head. Is that a good or bad thing? haha.