Who the hell was Geno? Not the Star Road guy — the actual Geno, the guy who Gaz's doll was based on. He's important enough to have a pretty advanced doll made of him (with star attacks for some reason), but nobody's ever heard of him except Gaz.
It might just be a custom toy.
A toy that Geno, or rather, the star-thing that possessed him, gave powers on the spot.