I saw these on a toy collector message board once and really liked them. They appeal to my interests in both plastic Kaiju monsters and cutesy kiddie stuff. So I kept my eyes peeled and came to the conclusion that nobody in my area has these for sale.
Fortunately I was finally able to pick up a set from the same person whose posts I had first admired. This is the whole set, minus paint variants, and they're a fantastic little line.I believe that they are mostly based on Ultraman villains, or at least a few of them certainly are.
My collection so far: