The new trailer for Build NEW WORLD: Kamen Rider Grease has revealed that Nariaki will be back as Mad Rogue. But it is not sure how he is able to transform back as he didn't have human experimentation on him to remember about the Old World.
Gentoku will appear without the beard this time & he will also transform into Kamen Rider Prime Rogue. In the first image, he is also seen using the Sclash Driver so it means that he will transform into his primary state too.
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