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Quote:

Originally Posted by KamenRiderOOO

You know why I think it fits that Mayu turns into Kamen Rider Mage? Remember her inner Phantom? It was all spiky and crystal like. That with the suit already having a skirt, makes it more that it was intended for Mayu in the first place, they just decided the design would also be good as a foot soldier in the movie

Either that or she was so last-minute of an addition to the series that they just co-opted the suit to use for her on the show.