Earth Federation Force

Yea, yea, it's ye olde EFF a.k.a feddies, available in almost any and every gundam series you've been into. Currently they hold not so much power as they once did, but are still trying to restore the peace, stability, democracy, and those kind of stuffs they once hang onto while fending off resistance groups, pillager vultures, and such folks. As of present state, they are the only one with MS building facility, although they too, are still trying to recover bits and pieces of the lost technologies for their mission. They are recruiting brave men and women to help their cause of balancing order in this desolate plains.
Posinote : It's yer usual federation stuffs, and currently, the only real deal military faction with government behind it, like, the official ones. Food and supplies are rationed by the bigwigs if you join, so you don't really have to scrounge for 'em like Resistances and Vultures. You'll be assigned with a standard issue MS should you enroll to be a pilot too, so you don't have to build from junk parts, scavenge or purchase for one. Not as extreme like the Titans or A-Laws, but doesn't mean everyone likes them too, no ?
Jack's Notes: A nice way to think of the current situation of the federation, Is the Coalition of Ordered Governments Situation in Gears 3, Basically Supplies are low, need to be scavenged up, manpower is in high demand, and along with materials for armor, aircraft, and mobile suits. However, not everything is as it seems here... maybe the brass have something going on? Theme: Enjoy it, it's awesome.
Freedom Fighters Resistance

Where there are governments are there, underground guerillas and resistance group that faces the other way are always there. They have their own vision about government and stuff, and with their voice left unheard, forced to take up arms to realize their dreams. Currently, the federation's grasp over the globe is thin, and these courageous revolutionists thinks that it is high time they end their long fight and achieve their kind of freedom, before the federation resumes its monopolizing and pressuring grip on the surface again.
Posinote : Well, in a sense, think of yer olde CB, Wing's colony fighters, or the Liga Militia from victory. Tho, your tech level won't be that stellarly above your enemies like the above stated three, so play it smart, not leeroy-ing your way into a joint mlitary training exercise with only four... *ahem* Nevermind, it's more similar to Katharon or Satelicon in terms of combat strength, but then again, the Federation is not on its top shape either, aren't they ?
Jack's notes: Basically, rebel alliance, except... even more strapped for materials. parts, and maybe not manpower. There's something wrong with the federation, and you boys see it while the others don't. Maybe you should look into it? ( no theme for you, yet)
Vultures

If you have seen After War Gundam X, you know these guys. It's a band of people gathering together, usually with a landship, sailing freely across the continents. Some are merely merchants, some are salvagers, some are mercenaries, and some might even be bandits, pillaging and raiding to fill their needs. Ain't so rare where vulture groups includes MS Pilots in their crewboard, of course, along with standard necessities like a Captain, Chef, Mechanic, and such.
Posinote : Think of free sailors, and you're free to do whatever the bloody hell your group wants. Tho, of course, it's always open to clash with other vultures, or even the other two factions should your way hinders theirs. Not to mention possible mutinies if you got internal quarrels. As for starters, we won't accept more than 8 slots for these, with the max starting players of 4 per group.
Jack's Notes: This is the choice drink and music of constituents resource gathering is a pain, salvage is just about your only means of retrieving supplies, along with trading.