What if Kamen Rider Fourze used the original plot :

"This season was originally going to have been about the Kamen Rider Club investigating various urban legends about Kamen Riders, and would have featured appearences of many past Kamen Rider actors, however, this was scrapped due to it being too similiar to Kamen Rider Decade"

It probably wouldn't have gotten so terribly bogged down in the middle and would have felt more like it had an overarching plot. It also would've been hella similar to Gokaiger.

Here's an interesting question that I doubt many of you will get, but I'm asking it anyway: What if Nobuhiko had escaped from Gorgom instead of Kotaro?

I can take'm!

Wait, why would I attack Sentai again?

His JUICY! puns.

I have no idea. I think everyone wants to fight me at this point :lol

We'd get Kamen Rider Silver, fighting against his arch-nemesis, Black Sun.

What if Nitou's rings could change his form rather than give him a mantle?

I would both laugh and enjoy if he did that, used Dolphi, and it turned him into a female Rider.

"Behold! I am the girl Magican Beast!" I still love when Nitou's grandma asked if Koyomi was Kamen Rider Beast when Nitou was embarrassed.

I still love that Sentai totally fell for it and thought Beast was a woman.