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Why was Mallow taken away from Nimbus Land? Who put him in that basket? Why did he have to go at all?
This troper assumed his parents got careless and accidentally dropped him off of a cloud in a tragic accident. The basket may have been his baby carriage.
Perhaps Mallow is younger than he looks and matures quickly. The game never really specifies how long he's been with Frogfucious and the tadpoles, so maybe a castle servant spirited him away to safety when Valentina took over.
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.