I was extremely entertained when I noticed there was formable Babylon in Vic2, including custom parties. And of course Byzantium for Greece. I'm all for having these kinds of semi easter eggs in the game, if only to spite all those "serious wargamers" 
On the other hand a lot of the suggestions in this thread are pretty much just name changes. Would be great if the game had a dynamic naming system ala Vic2 based on government and/or certain trigger conditions. Germany as monarchy would be German Empire, Germany as a democracy and Germania or something grand and pompous if they stay fascist and conquer their way to the Ural mountains etc.
On the other hand a lot of the suggestions in this thread are pretty much just name changes. Would be great if the game had a dynamic naming system ala Vic2 based on government and/or certain trigger conditions. Germany as monarchy would be German Empire, Germany as a democracy and Germania or something grand and pompous if they stay fascist and conquer their way to the Ural mountains etc.