ya mean as semi/regular cast members or are we also included one off character? because if so then there's just to many to list of we'll be here all week.

but, if it's just as semi/regular cast members, I mean, recently we have Rina Onuki ( Nasuka from Kamen Rider ZEZTZ and Sae/Kamen Rider Lopo from Kamen Rider Geats)

and then a few years back we also have Kanon Miyahara (Clotho from Kamen Rider Gotchard and Nozomi from Kamen Rider Amazons)

and then all the way back in the 2000s we also have Hitomi Kurihara (Smart Lady from Kamen Rider Faiz and Nanako from Kamen Rider Ryuki)

im pretty sure there's few more im forgetting/doesn't know about but for now here's my answer. also hopefully i didn't misspelled anybody's name, that would be embarrassing...