Alright, so, I've a few ideas, but only one of them have I really put a serious amount of effort into at present. You see, I know nothing about programming Civ V mods, but I do like to think I have a decent sense of visual design and aesthetics. As such, I have created some of the visual assets for this Civ I'm proposing already. What is it, you may ask?
Wily's Legions
Leader: Dr. Albert Wily
UA: Mass Production: When producing combat units,

Production cost is decreased by 5% for each of that given unit currently on the field. (Up to 15%)
UU1: Robot Master: I don't really have any specifics ironed out for this. I know it wouldn't unlock until you got the robotics tech, though, that's a no-brainer. It would also have a relatively low production cost, seeing as Wily puts out 8 of them in every main Mega Man game.
UU2: Wily Capsule: Again, I don't really have this one nailed down, some sort of air unit with a lot of movement capability.
UB: Wily Castle: Only just thought of this now, would be a replacement for the standard palace building that gives a small amount of

science in addition to the properties of the regular palace. Your Capital would start out with one of these, no matter the circumstances of the game.
I apologize if this comes across as infuriatingly unbalanced, but again, I've never made a mod before, I'm usually just an ideas guy with these sorts of things. I really do want to see this become an actual thing, though. Would need to be compatible with G&K/BNW as I have both. I'd like to see it put on the Steam Workshop as well if it does reach completion.
Some miscellaneous things:
Leader interaction screen:
Setup Screen Country Map:
(Or similar)
Spy Names: Spy Man

p), Shadow Man, Break Man, Quick Man, Bass, Mikhail Cossack, Ms. Y, Mr. X