For potential East Asian DLC:
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Flamethrower
After tweaking its stats, make it the second UU for the Chinese and trainable at Siege Workshops. -
Fire Lancer
The first regional unit, a foot cannoneer that can be trained at Archery Ranges in the Castle Age.
The stats are basically the same as Hand Cannoneer, only with a shorter range (maybe 6) and lower accuracy (maybe 55%). This makes it necessary to stay close to the opponent units to exert its strong power, just like how it worked in history.
It can be upgraded to Hand Cannoneer by Chemistry. This also reflects the evolution of gunpowder weapons from the fire lance to the hand cannon. -
Grenadier (using Thunder crash bomb), or Rocketeer (using man-portable artillery like Huolongchushui)
The second Regional unit. After Chemistry is researched, it can be trained at Siege Workshops in the Imperial Age.
Has infantry + Siege Weapon armor class, so benefited from infantry armor techs, Barrack techs and Siege Engineers. The projectiles have an explosive damage, great for dealing with buildings, siege weapons, ships, and dense units, but costly, slow to fire and have a minimum range.
The Chinese UT Rocketry may be able to benefit this unit. -
Fire Arrow Launcher
A siege weapon unit firing multiple arrows like the Nest of Bees from AoE4. Introduce it into the scenario editor only to serve the campaigns. The reason why I think it might not be suitable as a trainable unit is that besides it might be difficult to balance, it already has also been represented to some extent by the Chu Ko Nu and Scorpion (Chinese) and the War Wagon and Onager (Korean). -
Packed Town Center
Make the Packed TC a trainable unit at Mongol Castles after reducing its health and armor. The cost is 275 wood and 100 stone, same as the TC. After Nomads is researched, make the position of the button of Nomads become the training button for Packed TC. -
Hwarang
To be the second UU of the Koreans. As mentioned above, it can be a warrior monk unit, so it may be trained at Barracks or Monasteries. The introduction of Hwarang would well serve the campaign for General Gim Yu-sin, the great leader who unified Korea for the first time in history. -
War Wagon remake
Fires multiple arrows in a straight line instead of a bolt. This could bring it closer to its potential historical reference — Hwacha. If we can buff Korean Stables to at least not be so awful, maybe try making WW a cavalry + siege weapon instead of a CA units. -
Ninja remake
Not sure how, but maybe allow it stealth in certain situations, like when it has not injured yet and not launching attack yet. Maybe it could be a trainable second Japanese UU.