Bretonia has a government with a bunch of ships/positions/lore, Lemaitre can probably spill out 40000 pages of information about it if he finds this thread. Unselie RP's the Queen but [s]he's been inactive recently and only just come back. Kusari's emperor is RP'd and has a pretty big forum and ingame presence, Kanzler exists too.
I think people are a bit tentative about doing much with them though because it's a whole lot of power. CoZ is just zoners, but any house leadership decisions effect like 6 factions or whatever, and no change will please all of them. Just out of being polite I guess.