[MaskedRiderAsakura]

What about this: who's the ONE main Showa Rider who never got his own series (at least not to my knowledge)? RIDERMAN.


He was the first anti-heroic Rider ever encountered in the franchise and you can use the basis of the character to tell a really compelling, revenge-themed narrative. Doesn't have to be Joji Yuki (it's probably best if it wasn't), but you can use his backstory for inspiration: some guy that was working for whoever the big bad happens to be, maybe discovers that they're up to no good and tries to expose them, then gets badly injured (obviously in the fashion of losing his right arm) and/or killed for his betrayal.

If you must tie it into Amazons, you could have him die. Then it's discovered that he looked into the research that went into the new Sigma project (the one AFTER Season 2 of Amazons) and, knowing his time was up, had things set up to where he could be resurrected with new abilities, one of which is the ability to biologically morph his right arm into a variety of different weapons.

It could be pretty awesome if you had another Rider serve as somewhat of a hitman to take out "Riderman" or whatever his name ends up being. Maybe this hitman is only doing this job because he needs to take care of a family member/lover/whatever, giving it some of that grey vs gray morality that Amazons has.

Since you now have Amazon Prime Streaming for the really violent Rider stuff, you can really emphasize the brutality and anti-heroic nature of the character.

As for what I'd call it....I dunno. I haven't thought that far ahead lol.