[H3N51N]

I feel Boukenger. He just has Gokaiger's anniversary-theme.

Speaking of I'd also enjoy a Pirate-themed Kamen Rider, though I would make the collectibles coins & that can't happen since OOO did that. Maybe tiny cubes that resemble treasure chests the size of Astroswitches.

Or a military-based KR with forms based on tanks, jets & battleships. That collectible could be something akin to badges of honor.

Maybe a ninja KR that utilizes scrolls as the collectible.

Perhaps even an angel-focused KR with various halos as a collectible, though maybe Agito throws this idea into the "Used" pile.