[Eddy Madison]

I have 2 ideas for an anniversary season but it's not much:

1. Multiverse theme

Title Name : Kamen Rider Parter (not officially name)

The ideas is the protagonist gets his form change power up by going to other dimensions & met alternate universe of himself. The power ups are actually just his Rider based form but in different shapes, sizes & colours. He finally get his super form then eventually final form when he reach 5th or 10th dimensions.

While I add it, I would love if the show written by Kazuki Nakashima the creator of Gurren Lagann (he even apparently wrote Fourze too)

2. A show that's a love letter to Showa & Heisei Kamen Rider

Title Name : Kamen Rider Passin (not officially name)

This is a character driven show where the main rider is represent Heisei Rider & secondary rider represent Showa Rider. The protagonist Ishi is your optimistic hero who are chosen to become a rider, he also has a friend (supporting character) named Mori whom an integral character later in the series. Ishi & Mori train to become stronger together while encountering monster, as the main rider Ishi has all the power ups like a Heisei Rider.

Tragedy suddenly happen to Ishi where he's fatally wounded to almost near death, while he's in comma Mori decide to become a rider as his temporary replacement until he fully recovers. Turns out Ishi can't be save with regular medical treatment so they gave him a special surgery that turn him into a cyborg, he can no longer use his Driver because it can only respond to a living being so they gave Ishi a new Driver that program for "mechanical being".

As for now Mori officially became the new main rider & Ishi became secondary rider.