If the developers want to add some more civilizations to the game, I have some suggestions.
1. The Teutonic Knights or the Hanseatic League.
Barbarossa is in the game representing the Holy Roman Empire, but the Teutonic held areas were always separate from the Holy Roman Empire, and are not represented by any of the cities names used by Barbarossa. The former German populated lands of Pomerania, Neumark, Silesia, Ostpreussen and Danzig could be utilized by the Teutonic Knights as well. Barbarossa also doesn't utilize city names from Belgium, the Netherlands, Luxemburg or Denmark, so they would be available for a Hanseatic civilization.
2. The Uralic peoples are unrepresented in the game, which means the Finns, Hungarians, Livonians, Estonians, etc.
The Finns and Hungarians would both be excellent choices, and could create in game rivalries, with either the Russians or the Ottomans. Sibelius or Mannerheim could be leader for the Finns, while King Stephen of Hungary could be the leader for the Magyars.
The Hungarians originated in the Urals and migrated to central Europe, so they could easily get some sort of conquest ability, for conquering land and making it their own. The Finns also originated in the Urals.
3. The Kingdom of Bohemia
Technically they were part of the Holy Roman Empire, but Barbaross does not utilize any city names from Silesia, Lusastia, Bohemia or Moravia, so there is no conflict there. 1/3 of the Czech population was German, so there cold be some diplomatic bonus for being allies with Barbarossa. Bohemia was also rivals with Hungary, setting up scenario possibilities. Bohemia allowed massive German settlement of its lands, in exchange for helping fight the Hungarians, so maybe a scenario where Barbarossa helps defend Bohemia from Hungarian attacks.
4. Alternative leader for France.
Rollo of Normandy, Louis XIV, Charles De Gaulle, Charlemagne or Charles Martel, depending on what period you want to pick from.
The Franks are widely credited as being the ancestors of the French people, so Charlemagne makes a good choice, but based on ancestry, I would favor someone representing the Normandy / Perche area of France.
5. In the Americas, I think the Wyandot (Huron) would make an excellent choice, as they could compliment a Canadian civilization (being allies of the French), if one was ever added to the game, and a lot of people seem to think Canadians will eventually be added to the game. The Algonquin, Ottowa, Ojibwa or Wabanaki Confederacy would also be logical choices, as they were also active in the colonial period, having dealings with both the USA / Canada. My vote would be for the Wyandot, but any of the tribes that were formerly allied with the French Canadians would work.
6. If Canada was ever added to the game, it would need to be a two leader civ, to reflect its start as a French colony (Canadian originally referenced the French inhabitants), followed by the British conquest. This would also lend itself for an excellent scenario opportunity. Additionally, in the early 1800's, a majority of the people living in Ontario and the Maritime provinces, were loyalists and their descendants who fled the colonies after the revolution, and moved to Canada. Therefore, there was a string cultural and linguistic connection between the British areas of Canada, and the USA.
7. Other ideas would be the Boers and Rhodesians, but they would likely be very controversial if added to the game.
8. For a Southeast Asia Civ, possibilities are:
Emilio Aguinaldo / the Philippines. Creating an instant rivalry with Teddy Roosevelt, who helped instigate the US getting involved with the Philippines and taking over control form the Spanish.
9. Going back to Europe, Lithuania would also be an excellent choice for a civ, as they could combined with Poland (Polish-Lithuanian Commonwealth), to create a powerful rivalry with Russia, and could function as an alternative leader to the current Polish civ.
10. In regards to Austria, I say leave them out of the game, unless they become an alternate leader for Germany. Austria started as an extension of Bavaria, before eventually becoming a separate duchy within the Holy Roman Empire. Tyrol, Steiermark and Kärnten were separate entities, albeit ruled by the Austrians. Austria didn't become an independent nation until after WW1, having always been an administrative division of something else.
11. Finally, the Dutch East Indies. The Netherlands are not yet in the game, so they could perhaps get involved via their overseas colonies.
1. The Teutonic Knights or the Hanseatic League.
Barbarossa is in the game representing the Holy Roman Empire, but the Teutonic held areas were always separate from the Holy Roman Empire, and are not represented by any of the cities names used by Barbarossa. The former German populated lands of Pomerania, Neumark, Silesia, Ostpreussen and Danzig could be utilized by the Teutonic Knights as well. Barbarossa also doesn't utilize city names from Belgium, the Netherlands, Luxemburg or Denmark, so they would be available for a Hanseatic civilization.
2. The Uralic peoples are unrepresented in the game, which means the Finns, Hungarians, Livonians, Estonians, etc.
The Finns and Hungarians would both be excellent choices, and could create in game rivalries, with either the Russians or the Ottomans. Sibelius or Mannerheim could be leader for the Finns, while King Stephen of Hungary could be the leader for the Magyars.
The Hungarians originated in the Urals and migrated to central Europe, so they could easily get some sort of conquest ability, for conquering land and making it their own. The Finns also originated in the Urals.
3. The Kingdom of Bohemia
Technically they were part of the Holy Roman Empire, but Barbaross does not utilize any city names from Silesia, Lusastia, Bohemia or Moravia, so there is no conflict there. 1/3 of the Czech population was German, so there cold be some diplomatic bonus for being allies with Barbarossa. Bohemia was also rivals with Hungary, setting up scenario possibilities. Bohemia allowed massive German settlement of its lands, in exchange for helping fight the Hungarians, so maybe a scenario where Barbarossa helps defend Bohemia from Hungarian attacks.
4. Alternative leader for France.
Rollo of Normandy, Louis XIV, Charles De Gaulle, Charlemagne or Charles Martel, depending on what period you want to pick from.
The Franks are widely credited as being the ancestors of the French people, so Charlemagne makes a good choice, but based on ancestry, I would favor someone representing the Normandy / Perche area of France.
5. In the Americas, I think the Wyandot (Huron) would make an excellent choice, as they could compliment a Canadian civilization (being allies of the French), if one was ever added to the game, and a lot of people seem to think Canadians will eventually be added to the game. The Algonquin, Ottowa, Ojibwa or Wabanaki Confederacy would also be logical choices, as they were also active in the colonial period, having dealings with both the USA / Canada. My vote would be for the Wyandot, but any of the tribes that were formerly allied with the French Canadians would work.
6. If Canada was ever added to the game, it would need to be a two leader civ, to reflect its start as a French colony (Canadian originally referenced the French inhabitants), followed by the British conquest. This would also lend itself for an excellent scenario opportunity. Additionally, in the early 1800's, a majority of the people living in Ontario and the Maritime provinces, were loyalists and their descendants who fled the colonies after the revolution, and moved to Canada. Therefore, there was a string cultural and linguistic connection between the British areas of Canada, and the USA.
7. Other ideas would be the Boers and Rhodesians, but they would likely be very controversial if added to the game.
8. For a Southeast Asia Civ, possibilities are:
Emilio Aguinaldo / the Philippines. Creating an instant rivalry with Teddy Roosevelt, who helped instigate the US getting involved with the Philippines and taking over control form the Spanish.
9. Going back to Europe, Lithuania would also be an excellent choice for a civ, as they could combined with Poland (Polish-Lithuanian Commonwealth), to create a powerful rivalry with Russia, and could function as an alternative leader to the current Polish civ.
10. In regards to Austria, I say leave them out of the game, unless they become an alternate leader for Germany. Austria started as an extension of Bavaria, before eventually becoming a separate duchy within the Holy Roman Empire. Tyrol, Steiermark and Kärnten were separate entities, albeit ruled by the Austrians. Austria didn't become an independent nation until after WW1, having always been an administrative division of something else.
11. Finally, the Dutch East Indies. The Netherlands are not yet in the game, so they could perhaps get involved via their overseas colonies.