Chimera: Kind of like a giant salamander,and the first G.M.C to enter the story.(Yang)
Weapons: Plasma Beam, Rocket Launchers, Missile Launchers, Turrets, Gatling Guns.
The up-graded version: Ray Beams, Grenades, Grenade Launcher's, Shock Turrets, Hydra Cannons.

Fluffy: Giant metal peacock, and the only G.M.C that could go toe-to-toe with Chimera.(Yin)
Weapons: Flamethrower, Rocket Launchers, Missile Launchers, Turrets, and the tail feathers are tip with blades.
The up-graded version: Grenade Launchers, Plasma Beam, Atom bombs.

Clinker Drone: Gets it's name from the distinct Clinking sound it makes when it walks. Potenially dangerous in large numbers.(Yang)
Weapons:Unkown
The up-graded version: There won't be one.

Blunt Drone: Relies on brute strength rather than weapons.(Yin/Yang/Military)
Weapons: Flamethrower
The up-graded version: Undecided

Leviathian: Contsruction on this G.M.C began after the entrance of Chimera and Fluffy. Leviathian is both an aquatic mech and a burrower, However this G.M.C must be piloted.(Military)
Weapons: Plasma Beam, Rocket Launchers, Torpedos, Ray Gun
The up-graded version: Undecided

Sniper Drone: Prefers to snipe at opponents rather than attack head on, as then have weak armor. (Military)
Weapons: Sniper Rifle, Ray Gun Grenades.
The up-gaded version: There won't be one.

Gunslinger Drone: A Billy Badass kind of G.M.C, Loves being the focus of attention, they have weak armor but their more dangerous than the military's Sniper Drone.(Yin)
Weapons: Gatling Gun, Rifle, Machine Gun, Pistols.(Any gun it can gets hands on.)
The up-graded version: There won't be one.

Dancer Drone: a straight-forward melee fighter. it's movements are swift and unpredictable.(Yin)(Got the Idea from Kingdomhearts 2)
Weapons: Melee fighter.
The up-graded version: Undecided

Creeper Drone: An assassin type G.M.C. It lurks in the shadows around it's opponent/target waiting for the right time to attack. beware taking on more than one at a time.(Yang)
Weapons: Blades, and other weapons that pop-out of hidden contraption's.
The up-graded version: Undecided.

Hydra: A giant snake with horns (also called a drake by some people) It seems to have become the Mascot for Yang's side, low attack but high defense.(Yang)
Weapons: Flamethrower, Lazers, Dark Beam, Hydra Cannon.
The up-graded version: There won't be one.

Gara: This G.M.C taking on the form of a giant turtle, is the Mascot for Yin's side, High Attack and Defense.(Yin)
Weapons: Flamethrower, Plasma Beam, Lazers, Hell Cannon, Short-circuit emitter, and Blades.
The up-graded version: Undecided.

Bahumet: A moving fortress.(Military)
Weapons: Unkown.
The up-graded version: There won't be one.

Crawler: A Cargo Carrier.It resembles a really big Clinker Drone. It has a very high Defense and Attack.(Yang)
Weapons: Mostly Unkown, It's Legs are dangerous enough ,but the Dark Beam is worse.

Esper Marionettes: A group of Five puppets controled mostly via a flute.(Yang)
Weapons: Varied from puppet to puppet.
The up-graded version: Undecided.

Calus: A G.M.C that resembles a human male, he serves as a bodygaurd for Yin.(Yin)
Weapons: Varied.
The up-graded version: Undecided.

Zeus: Attacks with lightning based attacks.(Yin)
Weapons: Varied.
The up-graded version: There won't be one.