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well there was a lot of brainstorming going on here i was just trying to help

I think they should change the color of the units, but then it matters not if they personalize it, just as long as they can tell the units apart.

No, it's not about the -time- in which they're upgraded. Remember, they don't steal them all at once.
It's about -how- they upgrade.
You have to factor in if they are all identical like a mass production, then it takes longer to get those out there.
If they all vary in some way, then it'd be easier for them to get out there, but harder for us to draw.

The thing is, ZEON were a republic, with lots of money. They created mobile suits.
These are rebels stealing and upgrading units....

Right. So, the rebel version is re-armored and has a 50mm gun, one or two disposeable missile launchers, and a combat weapon such as the "heat hawk" used by Zakus.

Onto the military. I think they should be based on the military currently in use by the armies involved.

USA
*One cheap, generic, general purpose "cannon fodder" unit - equipped with a 110mm machinegun, 2 grenades and can opt to replace the machinegun with a missile launcher. Carries a combat knife for close combat.

*One large, heavily armored "fire magnet" unit - This is based on their Abraham battle tank, so it has a stupid vulnerability to its front armor, and its side armor is superior. It will have head mounted 50mm CIWS weapons, and a choice of 120mm machinegun, 200mm recoiling cannon, or a missile launcher. It will also be the first unit to mount a small shield. It also has two grenades on its side, muchlike the fodder unit. Has a sword for close combat, like a military sergeant would.

UK
*One very lightly armored "sniper" unit, armed with a 90mm sniping rifle with high-strength armor penetrating bullets, and high mobility thrusters for evasion. Lacks a combat weapon.

*One medium armored unit, cheap and general purpose. It has only the choice of a 110mm machinegun, or a 150mm cannon that fires depleted uranium shells. Can optionally be equipped with chobham plating. Lacks a combat weapon.

These are the first units produced for the war. At some point, a rebel unit using black market technology gains a Railgun. This attack will leave the team we're following very weak and damaged. Joining the UK forces up with a US team also plagued with bad luck, ironically called the "Lucky Aces", both demand assistance from their bases.
In retaliation, the UK will send their "Gundam", and the US will send theirs.
Gundam will stand for "Greater-United-Nation-Defensive-Allied-Machine", as the US and UK collaborated on their construction.
These two will be the Gundams in the story, that change the way.

Rebel Unit type 2:
This unit isn't a stolen mobile suit, but a black market illegal construction. It's got strong armor and higher mobility, being able to actually compete properly in a war. Think of this like the Kampfer for Zeon - a high end model, quite expensive. The majority of them use stolen weaponry from other mobile suits, except the leader, who has the Railgun.

US Gundam:
Is chunky and slow-moving, but lighter than the second unit they produce. This unit is a universal unit. It has mounted 60mm CIWS in its head, carries two swords for combat, and has a special armament to deal with the rebel leader known as a coilgun (coilguns are compact railguns) Uses a small shield. The two swords can be replaced with a JAVELIN weapon prior to mission rollout.

UK Gundam:
The first UK unit to have a combat weapon! It mounts a 40mm CIWS pod on the right side of its head, with the ammo box on the left side, rather like Gundam MK II does. It has a torso mounted weapon that holds two missiles in it, consealed behind a plate. This will be used in a "surprise" attack at some point. This unit's gun is a long-range assault rifle, so that it can support both of the previous mobile suit types in production. The rifle has semi-automatic and fully-automatic firing modes.
Unit mounts a LONGER shield than the other Gundam. Close combat armaments consist of a kukri style blade for fast fighting, and a large HAMMER for slow combat.

Later into the story, "late type" mobile suits based on these Gundams will be created.

Now, We have TWO ms types for the rebels. They need like, three more.
Ideas?

But you have to remember, a mace has a slow attack speed. Guerillas rely on fast hit-and-runs.
It's not in their agenda to carry bulky, slow-speed weapons.

well the mace idea is a good one, so we might wanna reserve it for later..?
what about a gun with a combat knife attached in front? I think that'd be kinda cool, for the U.S Gundam as the middle between the first and the second generation.
for the U.K, we can add two low destruction bombs on the suit for distraction purpose, since the first generation is so vulnerable... ?

Well, the mobile suits are designed for what people typically think of as the nation's strongpoints.

UK
Snipers
Sustained Fire

US
Cannon Fodder
Bigger Units

So I made one of each. The beyonet doesn't suit the UK units at all, as they aren't DESIGNED for close combat until their Gundam is created. It's possible that the bigger unit of the two US ones could use a Beyonet.

As for the mace, it should be a rebel-use weapon that comes into play once the Gundam Hammer is used (and ours is not a ball and chain, it's a giant two-handed sledgehammer)