LIGHT MERC:
Slightly taller than the average human soldier, the basic clothing these mercs would wear is brown and grey thick woven padding, possibly made of kevlar or leather. 
Attached to points such as the shoulders or chest they'd also wear small metal armor pieces, some riveted together like scales, and some tied down in plates. 
A cool attraction I thought of would be the randomization of the basic body sprites, with some examples being legs wearing things like leather boots, a holster, unique armor designs, arms having a symbol stitched to them, gloves, a red bandana tied around them, or even having a bare patch of skin with a tattoo, or scar. 
Some more examples are having chests wearing randomized items like ammo belts, upgraded armor, a coat or vest, and heads having different hair colors, hairstyles, cigars, cigarettes, scars, tattoo's, facial hair, and things like cowboy hats or eye-wear.


HEAVY MERC:
Heavy Mercs would be like the lights, but encased in heavy modern armor, and have a few exclusive randomized clothing items like decorative shoulder pads, or an ancient bronze spartan helmet with red plume, instead of their usual modern headgear. 
Due to the violent and gritty atmosphere I'm aiming for, both types of merc would have loud and angry screams and yells when being damaged, or dying. 
Both would have gory spurting and gushing blood effects, as well as "flesh" looking attachments on the chest and face, so that through extensive damage, the skull, or ribs could be shown. 
Lastly, both mercs would be able to take much more damage than the average human soldier in cortex command.




"PUMP SHOTGUN":
Typical pump shotgun, with a shell saddle on the side, or a modified grip replacing the slide.
It'd fire fast and have low spread, so it'd have long range and be quite powerful.
Firing modes would be Buckshot and Slugs.

"SAWN SHOTGUN":
This weapon would be full of character, and have different sprites for randomization.
It would have a two round magazine, so if you wanted to "fire both barrels at once", you could simply double click fire. It'd be fast to reload and be powerful, but very short ranged.

"BURST PISTOL":
Three round burst fire pistol, with low power. To balance it out, I would give it a fast fire rate, coupled with the burst firing, so it'd be able to dish out a large amount of bullets at once.

"REVOLVER":
This weapon would be extremely powerful, with such large bullets than the cylinder would only carry five. The reload time would be long, with no speed loader.
It'd have a longer than usual modified barrel, so it'd be very accurate. The enemy would have to ask themselves one question. Do they feel lucky?

"LIGHT AUTOMATIC":
This gun would have a telescopic sight, that you'd be able to toggle. It'd also have high-damage bullets, and fire fast. With a dual-mag taped magazine, it'd also reload quickly.
The fire modes would be full auto, and burst fire.

"HEAVY AUTOMATIC":
This would be the tacticool automatic, but with an underslung grenade launcher, instead of a dual magazine.
It's fire modes would be full auto and single shot. It'd also have a working bayonet attachment.

"LIGHT MG":
The light MG would fire fast and have decent powered bullets, but would have low accuracy. It'd be magazine fed, with a working under-slung chainsaw bayonet.

"HEAVY MG":
Heavy MG with a medium fire rate, damaging bullets, low accuracy, and very long reload time, due to being box magazine fed.

"BATTLE RIFLE":
This weapon would be light and compact, as well as fast firing, and get decent damage. It'd have a good sized magazine, and would not be equipped with a scope.

"BOLT ACTION SNIPER":
Bolt action sniper with have a long distance scope, high damage, good accuracy, but a small magazine and long reload time.

"BOWIE KNIFE":
The bowie knife would have two modes, regular slashing, and as a throwing knife function. The throwing knife function would be one time use, and stick in the target, doing a standard 100 damage.

"CHAINSAW":
Damaging, and heavy chainsaw for close range last resort use. It'd have blood on the blades, and infinite ammo, but would overheat fast. It'd also be equipped with a side mounted compact flamethrower.

SHIELD:
Large, heavy, and almost inpenetrable shield, perfect for taking on an army.