The Syndicate

I think it sounds like a fun game. We did a simpler "pick your own character from anything" game on RYM years ago and it was a lot of fun.

Recommendation: you could even start allowing people to request characters for this before it is in sign-ups, to limit the amount of time you'd need to build everything appropriately. Perhaps if the game enters a full game queue, you can volunteer to go last and begin accepting requests immediately anyway.