Discussion Characters / KamenRiderZiOPastRiders

Question: I want to add the number of new Riders that Diend is likely able to call this time, but what do I do with specific alternate forms, like KR Joker? Technically he's different from W, but he is still half of him too. I want to ensure as accurate a count as possible.

Renaming the page to Characters from past rider series instead of past riders, because with Fourze characters other than Gentaro were shown.