[Daikaijuman54]

You know, this sounds kind of fun, so I'll drop a few ideas here and maybe some art, depends how things work out. So I'll start with something original.
-Name: Kamen Rider Royal. Main color scheme is blue and silver. Main body is black with silver and red stripes. Helmet is reminiscent of Thouser and Cross-Z with a lion's mane and light blue eyes. Right shoulder pauldron with a lion's fur adorning it. Has a thin blue cape behind the pauldron with the emblem of his RegaliaCrest situated on it.
-Driver: KingDriver. Shaped like a castle. Has scabbard.
-Key Item: RegaliaCrests. Banner shaped gimmick, probably with a scroll-opening function that reveals the banner.
-Weapon: Regiscepter. A scepter that also works as a sword (Think Ultraman Geed Royal Mega Master) The Sword uses the RegaliaCrests' powers to perform attacks, while the Scepter uses them for various abilities, such as defense or casting spells, and would be used outside of combat.
-Rider Machine: GrandStallion. Reminiscent of Ryuki's Final Vent, but as a blue and silver Pegasus. Can change into a flying mode and fuses with a mech (Because it seems like Reiwa Riders are going to have mechs.)
-Alternate forms: Similar to Zero-One's forms, as the powers form over his base form. Dominant Gorillord, red and orange gorilla-like armor with large fists and bulky shoulder pads, helmet becomes more rounded with the crown and eyes barely protruding, heavy form. Sureswift Eagalia, white and teal eagle-like armor, fur design is replaced with feathers, wings appear on helmet, back, and across his arm and leg armor, gold talons spread across the body, flying/speed form. Wisened Owlearner, purple and green owl-like armor with a more robe-like appearance, with long sleeves, coat, and collar, helmet adds a pointy wizard hat with stars onto it, rainbow(?) sash across chest. Power-up and final forms will be updated later.

I'll probably add story, characters, villains/monsters, other riders and illustrations at a later date. I even have an ideas pitch for a potential 50th anniversary Rider series.