No one, just name your royalty 'Senator So-and-So.'
They're intentionally slow so that they act as kings rather than pawns (or any other given chess piece). You're supposed to keep them safe, and you're not screwed so long as you have any more cities. You only need one of them and you get as many of them as you have cities that you've brought up to Metropolis. It's either that, or you need to have your starting city or any pop 6 city. This is basically the same thing, but actually more versatile and moveable.
Ah, that would work. Although in my case I basically view it as a coalition of monarchies(I was just making a point
but you proved me wrong pretty easily).
True...So wait, is there any way to regain them once they're lost? Or do you just need to get more pop 6 cities?
And how will we keep track to make sure we remember which one's which?
I feel maybe there should be a unique non-producable Honor Guard unit for this purpose. Heavy Infantry give or take a bit in terms of stats(lower to represent mostly ceremonial purpose, or higher to represent best of the best; maybe just the same, since they probably wouldn't benefit from Barracks, Master Blacksmiths, or Health Fountains so it balances out to be that anyway) but 2 Movement(I'm sorry but 1 movement is just ridiculously slow and that's my biggest concern at the moment). Still not all that fast, horsemen can still catch up, but easier to keep track of and not quite so vulnerable. Can still be killed and are at risk of being killed, but it also gives an incentive to use them; they're quite good in a fight after all, and can keep up with slightly faster land armies. Risk and reward and all that.
I kinda like the idea of mercenaries units, actually. Cost money to hire, no stat boosts save experience(since that can be set by the GM), and require higher upkeep, but might actually have lower health(since they're just fighting for coin, and would thus leave the field of battle faster) or aren't under the player's direct control(though this would result in a headache for the GM, in all likelihood), or have a chance of switching sides when they lose(random chance or proportions-wise?) though the new owner can choose whether to keep or kill(keeping does cost money after all, and a turncoat can't be trusted...).
Might be too much complexity. Mostly I like the idea of Pirate Lords or something, and possibly roving bands of mercenaries and/or barbarian tribes that can be diplomancied. Again, probably too much complexity to be useful/fun.
So....just Kashyyk then?