After seen original 8 civs are all reworked by last aoe3 major update, I do really hope such thing could also happens to aoe2, so I post this thread.
Yes, we already get some, like Mongols get Steppe Lancer, and there is a rumor that Huns and Goths will get Dromon in next Rome update.
But we should admit there are still 11 civs get nothing since Forgotten Empires dlc released.
Most of new civs, like Tartars or Bulgarians, they got at least 2 unique features on release, such as unique units, culture shared units or a new building, which make AOK civs looked simple and dull.
As I understand, AOK civs are major civs in human history, and are the roots of many later branched cultures, they should got more, or at least equal, but not less.
I think culture shared units is a good idea.
Since steppes culture got steppe lancers, surely middle eastern culture, Asian culture or European culture, three cultures with longer history and more variety should get something.
Here is my suggestion, just for reference.
Middle Eastern Culture:
Ghulams:
An all-round cavalry units recruited in castles.
Need university built first.
Can shoot enemy with bow, attack melee enemy with blade and throw touches to buildings.
Weakness: each Ghulams will took 2-3 pop.
Use armored Trade Wagons to replace normal ones, with thicker armor and higher hp.
Asian Culture:
Long Glaive Warrior:
Can be recruited in Barracks, be a new line or serve as a 4th tier spearman.
Deal aura damage like elephants, other stats are same as Halberdiers.
Use Rocket Launcher to replace catapults, it’s a catapult with longer range but lower damage, and need to unpack before fire.
European:
Crusaders:
A heavy armored infantry that could be trained in monastery.
Could heal other units when free from battle.
cost more golds than normal footman line units.
Use guild to replace markets, villagers could garrison in, generating small amount of gold every second, but can’t train trade wagons.