Politicians and Upgrades
There is now a universal imperial mercenary upgrade available to all civilizations.
Mercenary Contractor Fortress Age now also delivers 600-800 resources of faction appropriate mercenaries.
Mercenary Contractor Imperial Age now researches the imperial mercenary upgrade and ships a larger amount of faction appropriate mercenaries.
German Unique Church mercenary upgrade now allows shipped mercenaries to be trained in normal production buildings.
Factions
allow Native Americans to train mercenary units in their hut, and guarantee them and the Indians an extra artillery mercenary. allow captured mortars to be trainable in age 4 as well as infinite artillery mercenary shipments for these civs.
perhaps ottoman consulate bombards for Indians and Thunderbolts of Illapa for Incans allow them to retrain a limited amount of those units.
older civs gain the new mercenaries as cards from the expansions/dlc.
Units
some mercenaries need changes, like the Arsonist. it feels wrong to have a bare chested torch throwing unit from that area called Arsonists. besides being absolutely worthless as a unit in game, it seems pretty offensive. instead a new Indian mercenary unit like Sikh musketeers or a super howdah would be welcome. even better to let the Indian aoe3 community design an Indian mercenary unit and let them join in the process. if you feel that the game needs a grenadier mercenary then a grenade launcher mercenary can be added in as well.
speaking of useless Indian mercenaries there’s the Jatt Lancer, a unit which severely underperforms for its price. it needs a pop and cost reduction or massive stat boosts.
the Hussar alternative Stradiot can also use either a stat boost or a pop/cost reduction as it also underperforms for what it asks. compare it to the Manchu and Cavalry archer or Musketeer and Highlander.
Sennar also underperforms when compared to its counterparts like the mameluke. its slower than mamelukes, does less damage than mamelukes, and despite having 2 armors its squishier than mamelukes. its a textbook example of a unit that has no place in the game like the Arsonists and the Jatt Lancer when compared to its alternatives. we should give it clear strength and weakness such as having standard cavalry speed, 1250 hp with 50% melee resistance and 80% siege resistance as well as 20 attack x 3 vs heavy cavalry, heavy infantry and artillery. in this way it would be clearly differed from the mameluke as a melee specialist, essentially a mounted jaguar warrior that also excels vs artillery.
barbary corsairs should be cheaper and more should come with shipments, they are not worth 200g like highlanders and iron troop. they should also have a pirate themed ability, such as granting a gold bounty in addition to xp for units they recently damaged.
landsknecht are too expensive and too few come in shipments, they should not be worth more than highlanders and iron troops.
Napoleon Guns feel like a meme unit, it costs the same as a falconet yet its inferior in all the ways that matter such as range, damage, aoe and ranged resistance. it should be retooled as a horse gun or falconet mercenary class unit with the leather cannon based model and the stats to match. there is a need for artillery mercenaries yet these cannot meaningfully fulfill that role.
Zouaves are also meme tier. costs twice a hussar/highlander for the same or lower hp and has low damage and siege with no multipliers, what exactly is the point of this unit? id rather take iron troops or highlanders or even hussars which cost half the resources of this unit. it needs the stats to back up its costs and it needs something to differentiate it from the pack, such as a grenade/satchel charge ability or being able to construct Fortifications cheaply and quickly. as it is its actively harmful to have these units in your army due to their drain on your pop and coin while providing nothing of value in return. I wouldn’t take them for free in age 4 if I had the resources to make other units.