Continuing where we left off...
Leaders in 4X games tend to bring some much needed faces to a genre that is traditionally dominated by numbers and objects. However, when it comes to actual gameplay it's rare for these special characters to be anything more than a mild stat boost. In the case of planetary administrators, each individual could have a personality to go with those production buffs running the gambit from Winston Churchill to...well...his predecessor Neville Chamberlain. A die-hard planetary governor might never give up the cause even when an enemy fleet hangs menacingly in the skies overhead, but others might have more practical or even opportunistic outlooks. Perhaps they could be persuaded with a big enough carrot or stick...or both. Threats and bribes aside, another possibility could be what I like to think of as the "Lando Calrissian" scenario, a local leader who remains loyal in secret, providing information or aid through backchannels to their empire of origin (possibly because the conquerors aren't holding up their side of the prearranged bargain).
When you get down to it, the best sci-fi tends to be a combination of two things; scientific concepts spun out in a compelling directions and interesting characters that the audience can identify with. Space 4X games tend to be hit or miss with that first part, but it's with the second that they really tend to drop the ball. I get that trying to create an interesting cast in a procedurally generated game is a tall order, but if someone could crack that nut, even if only partially, then they'd have something truly special on their hands.