People in various regions outside of Japan can vote for three Riders of their choice to become part of the chemy card lineup. A few friends confirmed had confirmed it to me.
Basically how this works is, that you can vote for three of the Riders or Forms of your choice. Let's use Wizard as an example, you can vote for Land, Water, and Hurricane forms for Wizard, it's not just limited to Riders.
If you loved Geats Oneness, you can vote for it as well.
It's not just limited to the TV series, forms seen in Outsiders and the various theatrical-exclusive releases of Kamen Rider can be voted for as well. Each one is limited to three votes; after that, you won't be able to access the voting form.
I hope this has been informational for everyone.
You can vote here: https://toy.bandai.co.jp/special/ridechemytc_vote/