The answers of the female cast of Kamen Rider Zeztz when asked if they wish to become a Rider like most female characters in the Reiwa era:
>Yagi / Minami Yorozu: (Answered immediately) Of course! I want to transform right now. If I could transform, I want to try a cool style.
>Rina Onuki / Nasuka Nagumo: I have already appeared in Kamen Rider Geats before and have transformed once, so in this film, if the character Nasuka has an appealing transformation, I would also like to try. It also depends on the story development.
>Maho Horiguchi / Nemu: Right from the audition, I assumed I would transform (laughs). I even practiced shouting “Henshin!” at home, ready to transform. So if I get the chance, please let me try!

I wonder if we'll indeed get one, the west does apparently want female riders and every show written by Yuya has had female riders even if they were never conceptualized by him but the producer. That said Yanaka doesn't strike as the guy who would care about something like this, and seeing the listings/leaks we've gotten so far and how he talked in interviews I feel like his focus is to make this show with the least amount of Riders he possibly can while still appeasing to Bandai, so if we do get a female rider eventually I think we'll only get just one.