Despite the impracticality of black powder firearms in a setting where everyone regularly uses modern assault rifles, shotguns, SMGs, and energy weapons, it would present a unique option for henchmen that have powerful but long recharge ranged attacks mixed with not as powerful but short recharge melee attacks. Along with the ability to decrease the recharge on those ranged attacks as the player gets stronger. They would be resistant to fear, confuse, and disorient. They would also only be resistant to smashing damage out of the gate as there was no such thing as body armor outside of the metal breastplates some cavalry wore.
This would be a perfect powerset for those Heroes (or Villains) who want to reenact the old days of Napoleonic Warfare and use it against their foes.
Tier 1 Minion: Fusiliers
Line Infantry equipped with smoothbore muskets and attached bayonets.
With no upgrade powers active, they are capable of firing a quick, but powerful "Snap Shot" with a long recharge and able to strike enemies in melee with the buttstock of their musket.
With the first upgrade power active, they will gain access to two new melee attacks that utilize their bayonets. A quick stab and a longer lunge forward. They would also gain a new ranged attack called "Buck & Ball" which is similar to the Buckshot ability, but in a narrower cone, is slightly longer range, and also has a long recharge.
With the second upgrade active, they gain access to "Reloading Drills" as an Auto ability that would decrease the recharge time on their ranged attacks. They would also gain "Discipline" which would increase their resistance to any psychological effects like Fear, Confuse, and Disorient. Lastly, they would gain a new "Aimed Shot" ability that is more accurate and damaging than "Snap Shot", but takes slightly longer to fire due to having to actually aim and is not a Snipe ability.
Tier 2 Minion: Jaegers
Skirmishers armed with muzzleloading Long Rifles that are longer range and more damaging than muskets, but even slower to reload.
With no upgrade powers, they would have access to "Rifle Snap Shot" which is similar to the one the Fusiliers get but has an even longer recharge and is slightly more accurate and damaging thanks to the use of a rifled barrel. They would also get "Rifle Aimed Shot" which would be similar to "Aimed Shot", but once again slower and more powerful than the musket counterpart but is not a Snipe ability. They would also have two Melee attacks. Brawl and the ability to strike with the butt of the rifle.
With the first upgrade, they will be given Sabers to be more effective in melee. Nothing really much to say here other than you can easily just copy/paste some of the Broadsword abilities.
With the second upgrade, they will gain Stealth, Reloading Drills, and "Rifle Snipe".
Tier 3 Minion: Sergeant
A non-commissioned officer armed with a smoothbore carbine and saber. They are capable of using abilities to buff you and your allies in combat. Thanks to the shorter barrel of their carbine, they are also able to use ranged attacks more often than Fusiliers and Jaegers at the drawback of shorter range and less damage.
With no upgrades active they have access to a lesser version of the Maneuvers Leadership ability, "Carbine Snap Shot", and a single sword attack.
With the first upgrade, they gain access to a lesser version of the Tactics Leadership ability, Reloading Drills, "Carbine Aimed Shot", "Carbine Buck & Ball", and "Black Powder Bomb" (just a flavored Frag Grenade).
With the second upgrade, they gain a lesser version of the Assault Leadership ability, Discipline, and multiple saber attacks.
Player attacks/abilities:
Pistol Shot: Fire a single shot from your pistol at an enemy. Moderate Recharge Ranged Attack
Saber Swing: Swing your saber at multiple enemies in front of you. Short Recharge AoE Melee Cone Attack
Saber Thrust: Thrust your sword into an enemy. Short Recharge Melee Attack
Fire at will!: Temporarily disables all Melee attacks on your Henchmen while significantly increasing their rate of fire, accuracy, and damage with all Ranged attacks.
Charge!: Temporarily disables all Ranged attacks on your Henchmen while increasing their movement speed, accuracy, and damage with all melee attacks.
Equip Arms: The first Upgrade ability. Fusiliers and the Sergeant are given Tricorn, Bicorn, and/or Shako hats. The Jaegers are given Sabers.
Advanced Training: The second Upgrade ability. Fusiliers are given Backpacks and Jaegers are given greatcoats. Sergeants have no visual change.