My little brother, who has severe autism, hyperfixates on Mario and when he saw me looking at this on my laptop he absolutely loved it. Yoshi is his favourite and if he likes it, you've done a splendid job; thanks for making my little brother smile.

That's actually a very nice power-up concept.
Maybe they could have forms matching the other dinosaurs and alts of the series?
(Rosalina could easily pass for a Space Plessie)