Ok, now for Northern Europe:
First, an additional Central European civilization:
Hessians/Rhinelanders
Location: Central Europe, eastern France, Low Countries, Eastern North America
Language: Rhenish German
Unit: Hessian Auxiliary - Grenadier
Techs:
Black Forest Gamekeepers: Hunts give more meat, Jaegers become recruitable from taverns and equivalents and Jaegers may gather hunts
Palatine Handcrafts: Increases wood gather rates, prolongs output of trees
Impressment: Decreases training time for all infantry and cavalry
**
Belgians (rather anachronistic, but collective term for both Flemish and Walloons)
Location: Western Europe, particularly France and Low Countries
Language: French
Unit: Walloon Guard (Musketeer with grenade attack against buildings)
Techs:
Flemish Wool Trade: Sheep trickle coin
Burgundian Court: Age-ups and Age V Capitol techs and equivalents receive a discount
Expeditions: Explorer LOS and attack against guardians increased
**
Norwegians:
Location: Scandinavia
Language: Norwegian
Unit: Mountain Troops
Note: I don’t think this unit should be shown with sleds because it would make no sense on maps without snow, that’s also why I think skiing should be represent by a tech and not as the name or model of the unit.
Nordic Skiing: Increases speed of light infantry, especially Mountain Troops
North Sea Fishing: Can be sent twice, delivers a school of cod
Northern Timber: Delivers a crate of wood for every 5 minutes of game time, up to 30 minutes
**
Finns
Location: Scandinavia, some Eastern Europe maps
Language: Finnish
Unit: Karelian Jaeger (Recycles concept of Finnish revolt unit, being a light infantry that gathers wood)
Techs:
Reindeer Herding (borrows from @Skadidesu 's proposal for Sami - my “Finns” are supposed to be a catch-all for all Nordic Finno-Ugrians): Can train herdable caribou (Reindeer) from livestock pens/native farms/ etc.
Sisu: Finnish resilience grants your soldiers 10% more HP
White Death: All light infantry get a 15% bonus to damage
**
Scots:
Location: British Isles, Saguenay, Dakota
Language: Scottish Gaelic/Scots
Units:
Highland Clansmen (as proposed by @Jonasnee8581 under the name Jacobite swordsmen)
Piper: Scotsman with a bagpipe that functions like a Hausa Griot, but cannot heal
Techs:
Highland Clearances: Get a delivery of 8 sheep, livestock fatten more quickly
Royal Scots: Highlanders become recruitable at the tavern and equivalents
**
Irish
Location: British Isles
Language: Irish Gaelic
Unit: Gallowglass (Doppelsoldner counterpart)
Techs:
Irish Immigration: Gain a settler for every 3 minutes of game time, up to 30 minutes
Inniskilling Dragoons: Ranged cavalry attack increased by 15%
Irish Agriculture: Cows trainable from livestock pens, livestock fatten more quickly, mills gather 5% faster
**
Finally, I had an idea to feature Bretons to add more to maps in France, but I’m not really sure what to actually add for them in terms of units or techs. I felt some inspiration from the Vendee Counter-Rebellion to the French Revolution, but I’m not sure what kind of unit it would be besides some kind of rough equivalent to an Insurgente (which I already proposed for Tyroleans). I also am not sure what the techs would be. Maybe a reference to the Edict of Nantes or Brittany’s maritime culture?