Please let it be Narutaki. Please let it be Narutaki. Please let it be Narutaki. :lolol

I think everyone is so caught up in Decade that they're ignoring the other analogy. Given Valvarad's physical similarity to Machine Chaser, it seems entirely possible to me that Legend is Gotchard's Kamen Rider Lupine. The absence from the main show, the confrontation with the main character, the golden armor - everything is the same. Of course, there are plenty of references to Decade too.

Whoever is our kamen rider Legend the person playing him is most likely some form of royalty as Legend is wearing gold and precious gems.

ohgawd. its a reiwa Decade. xD
be funny if its just Tsukasa who decided to use a new suit and a new name for the new era. (because 21 was just ridiculous)

I think gems is a reference to the jewels on riders' helmets.
By the way, interestingly, among the cards of legendary riders there is no one from Reiwa.

Now that you mention it, I can't wait to see Decade Complete form 31 or Zi-O 31 because Baskin-Robbins jokes. :lolol

This is how Decade should've looked like. I'm gonna pretend that this is Decade's only form.

No, it's Eijiro Hikari (!).:lol

Seiichiro Nagata will play the Legend-ary Rider.

Damn it! :lolol
Joking aside this seems to be his first ever toku role according to his resume having mostly done stage plays before this, so best of luck to him. And it appears Hotaro will go to Legend's world, in other words, a parallel universe.

More images of Kamen Rider Legend, looks like the rumor of him having Zenrin Shooter type weapon was also true (thank you Color). Also here's a look at Gotchard Exceed Mighty form.