What about different systems that riders could use? I'd kinda like to see a system for which the top and bottom powers can switch up readily. It'd take 2 collectibles to transform. While there would be a button on the driver for rotation (switching the top and bottom powers), you could also remove collectible items and replace them with others for when neither item in the current pair helps fight the monster of the week. This would require the henshin function to be separate from the finisher function, unlike the Build Driver, so I'm not sure if Toei will try it.

I'd like to see a kr called kamen rider geed.

How to get sued by TsuPro 101

He could be a KR from space with cosmic powers.

Actually you know what I saw a good potential theme. There's rumours of the next show using music, specifically stuff like Walkmans and headphones

If the new rider actually uses a walkman they're gonna be Faiz's best friend

Music in general would be a great theme considering the whole deal with belts today is jingles and stuff.

Let it be a music theme since Ex-Aid’s theme in video games!

Plus it’s be a chance to make up for Hibiki’s failure.

And since Kiva on vampirism - vampires, how about lycanthropy/zoanthropy?

Let's go full circle, and make the theme toys.
From non articulated sofubi, to transforming figures, to combining figures, etc etc.

I'd love another season to try a gothic aesthetic again honestly