My joking predictions for upcoming riders:

Ge-RZ (pronounced "gears"): Riders use gears to transform, the toys are compatible with the gears used by Zenkaiger and Donbrothers purely by accident

Gund: Bandai celebrates some important date shared between Gundam and Kamen Rider by retelling the original Gundam story with rider suits replacing mobile suits

Gorgeous: In Legend's world, a nobody has to step up and defend everyone when Legend goes missing

GAL: The first female main rider is a gyaru schoolgirl, she accessorizes her driver and weapons to be cuter which gives an in-universe reason why they're all colorful toys

Gaim Again: Follows Kouta's adventures as king of the new Hellheim world and his struggle to establish a peaceful Inves society

Ghost Again: Planned but cancelled due to Gaim Again's lackluster reception

The first series not starting with G since Geats

We haven’t seen a clown/circus motif on a toku hero before, and that’s something I would love to see someday, not necessarily next year. Actually, I don’t think I’ve seen a clown hero at all, usually clowns are villains.

I remembered this movie:
https://www.youtube.com/watch?v=7On-u2S1mqU

Too bad we never got to see Drive Type Speed Shift Circus.

I just hope the next series doesn’t have fully Silly-Fugly suits.
Anything is better than Candy-Riders, I can’t believe it’s gone this far childish

How about a new space rider since Fourze where it's mixed with underwater sea creatures?

Or go for a Chinese Zodiac themed riders where there are four riders based on the four seasons - spring, summer, autumn/fall & winter.

Or music theme since Ex-Aid!

Or dinosaurs mixed with cooking/chefs/foods! Toriko/Shokugeki style!

Wonder how bird-themed riders would work? Jets in Top Gun style?

And how pirates would work?

Taking gimmicks from the villains, of course.

It's had ups and downs but the overall trend in Kamen Rider seems to be that Toei is trying to incorporate more themes that are popular with young people, and it's been especially strong lately with Geats's videogame inspiration, Gotchard's collectable card monsters and Gavv's candy. I wouldn't expect that to stop anytime soon, so let me ask this: What's something popular with kids or teens that you'd like to see in Kamen Rider, and how would you want it to be used?

And 2 more based on the tropical wet and dry seasons as well!