There's an entire movie celebrating all 40 years of Kamen Rider, so let's go with some more to add to our cast!

First up, Ryuki cast. (http://kamenrider.wikia.com/wiki/Category:Ryuki_Riders) We've only got 1 of our 13 Riders, and we could always use more. Or Yui or Shiro. Seriously, drive Ren nuts.

As incentive, Ren is currently de-aged thanks to the Melting Clock. Can you say "blackmail"?