One of the key themes of Kamen Rider has always been that the heroes uses the same power as the evil beings to stop them. In the very first Kamen Rider, the two Kamen Riders were humans that were captured and experimented on by the evil organization to be their ultimate super soldiers but escaped and opposed them.
Since then, almost every Kamen Rider has had this element in some way, including the heroes using the same power source as the evil beings, the heroes being the same race as the evil beings/halfbreeds, the heroes working together with the evil beings, the heroes becoming the same race as the evil beings or some combination. Some examples (with major spoilers) include:
Kamen Rider Ryuki: The Riders gain their power by making a contract with a monster and borrowing their power. Failure to fulfill their end of the contract means the monster will eat them
Kamen Rider Blade: The monsters (Undead) can be sealed into playing cards and the Riders use the power of the Ace Cards to transform and the other cards for special attacks/upgrades. One of the Riders is actually an Undead using the power of another Undead to pretend to be a human. Another Rider's powerup turns him into an Undead by the end of the show
Kamen Rider Faiz: The monsters (Orphenochs) are actually an evolution of humans. Humans who are capable of evolving become an Orphenoch after they die. The transformation devices are only designed to be used by the Orphenochs and normal humans can't use them. The Riders either are Orphenochs or got injected with Orphenoch DNA.
Kamen Rider OOO (probably resembles Hero-san and Former General-san the most): The Greeeds are the monsters and there are initially four of them. The Greeeds are powered by medals. One of them didn't trust the others and chose to side with humans, giving the hero the ability to transform into a Rider using the power of medals like the Greeed. Throughout the story, the hero gains a new set of medals that slowly turns him into a Greeed himself
Kamen Rider Wizard: The monsters (Phantoms) are beings that live inside certain humans. When the human falls to despair, their Phantom can break out and take over the human's existence. The Riders are people who managed to regain control after their Phantoms almost broke out or came to an agreement with their Phantom
Kamen Rider Gaim: It's a bit too much detail to go into the exact relationship between the Riders and the monsters here, but by the end of the show, two major characters including the hero himself become the same race as the monsters they fought. This also started off being a show about kids using Pokemon-like creatures to battle for territory to dance in.
What I'm trying to get at is that the latest chapter is a very typical Tokusatsu plot point and I doubt the existence of Madoka had much of an influence.
I've never watched any of this series so cool to know, thanks for the little summary!
