[Jkin62]

Who would it be? I've done this before but I was much more loosey goosey on the Rider power selection. So here's the rundown, it's the apocalypse. It's like the Legend War from Gokaiger mixed with Crisis City from Sonic '06 and there are foot soldiers and generals running around raising hell.

That's where you come in.
You get to pick the powers of any Secondary Rider to face em head on. And I do mean Secondary Riders, so I don't want anyone saying Ryugen or Snipe or Necrom and so on.
A bit of incentive to pick Birth, if you pick Birth you get a second helping hand with Proto-Birth.
Oh and if you pick Baron and decide you wanna go all Overlord on the the baddies, you have to turn evil and take over the world.

Now then, as for me? I'd go with either Mach or Meteor.
Mach because he's naturally one of the faster Riders in general since he can fight during the heaviness. Not to mention if I run into a Drive amidst the craziness I can be all like "Hey Drive, lemme use one of your shift cars to up my game!"
Meteor is #2 because I get to fight like Bruce Lee, I get a badass henshin/entrance, and Meteor Storm I'd say is one of the better final forms for a Secondary Rider.