Great Britain
Designers of heavy, bullish mecha; generally with a focus on shell-firing guns and steady platforms.
African
-15 tons
-1x 57mm gun, 1x Vickers gun
-Crew: Pilot.
Notes: The first 'proper' bipedal mecha, widely regarded as a flop. The 57mm gun packed insufficient explosive fill, and the then-revolutionary loading system was prone to breakdown. Resourceful Tommies would frequently hang off the back, beating the gun into action in exchange for a ride behind the protective armor. It was quickly retired after the Great War.
Bermudan
-35 tons
-1x 57mm gun, 3x Vickers guns.
-Crew: Pilot, Loader, Gunner-Commander
Notes: The first English quadrupedal mecha, this design was the real war-winner, according to the Armored Cavalry. Despite insufficient gun fill, reliable operation of the weapon by an internal crew mitigated this flaw and integral ride-along provisions allowed the mecha to deposit a half-platoon of descant infantry anywhere on the battlefield in relative shelter.
Columbiad
-40 tons
-1x 75mm gun, 6x Vickers guns in three double mounts
-Crew: Pilot, Loader, Radioman, Gunner-Commander
Notes: The finest refinement of the quadrupedal mecha in the world, this platform brings the heaviest mounted firepower to bear, both in general and ton for ton. The addition of a radio ensures these mecha never work unsupported. In addition, they frequently serve to transport platoons of descant infantry atop their backs.
Russia
Designers of fast, rocket-spewing mecha. Resistance to fire is less mandatory than the ability to deliver it.
Perun
-9 tons
-1x Maxim gun, 40x 65mm rockets
-Crew: Pilot
Notes: The first mecha to weaponize salvo rockets, contained in four wing bins. While Imperial Russian doctrine emphasized the press of engagement- to close to as little as 500 meters- before salvoing off each bin sequentially, the Soviet doctrine is instead to fire two bins together with the rest of the platoon in a preperatory salvo, then engage with the remaining bins on an individual basis.
Comrade Sokolov
-18 tons
-1x Maxim gun, 120x 65mm rocket
-Crew: Pilot
Notes: The first Soviet-designed mecha, this shows a clear inheretence of design from the Perun. In this case, however, the vehicle carries twelve bins, with the Maxim moved to the chin in an unusual mechanical turret configuration. While aim is debatable, what is not is the additional endurance the mecha brings over its smaller sibling, especially as Soviet commanders tend to use platoons of them to cover their smaller brethren as they retreat to rearm.
United States
Designers of a superlative number of mecha; many of which are not listed for brevity.
M19 Spider
-35 tons
-1x 37mm gun, 4x M1917 machine guns
-Crew: Pilot, Gunner, Machine Gunner/Loader, Machine Gunner/Loader
Notes: A copy of the French Araignée, this walker substitutes as many French components for American as possible. They number in the hundreds, but frequently are found broken down for repairs due to inferior articulators.
M22 Lightfoot
-20 tons
-1x 37mm gun, 4x M1919 machine guns
-Crew: Pilot
Notes: While nobody's quite sure how the Americans managed to get all these weapons into a single-pilot platform, the fact of the matter is the Lightfoot is the most heavily-armed single-pilot mecha in existance. Dripping sophistication from the secrets of the arm system to the weaponry loadout, this machine is tiny, but incredibly fierce.
M23 Wetfoot
-20 tons
-1x 37mm gun, 2x M1919 machine guns, 2x flare/smoke projectors
-Crew: Pilot
Notes: A waterproofed and ruggedized version of the M22 Lightfoot for the USMC, with two of the machine guns replaced with flare or smoke projectors.
Italy
Designers of artisanal mecha, few of any are alike. Due to extreme differences, only the overarching types will be listed here.
Ca.G120
-12 tons
-4x Mg 08/15 machine guns, Munitions Satchel
-Crew: Pilot, Gunner
Notes: Armed with two fixed machine guns for the pilot and two for the gunner, the Ca.G120 is a light, mountain-trotting terror. Field armorers would frequently replace the original Fiat-Revali machine guns, until after the Great War it was decided to standardize on German Mg08/15 guns. The munitions satchel is noted as Italian engineers would frequently ride-along, using the mecha to transport large quanities of explosives, mines, or even in some cases trench mortars to problematic positions.
Mc.J410
-18 tons
-2x Breda 12.7mm machine guns
-Crew: Pilot, Gunner
Notes: A very conventional gunner-over-pilot arrangement gives the Mc.J410 an almost uninterrupted field of fire, and the high-caliber machine guns allow it to reach out and touch targets at unprecidented distances. Often refered to as the Great Marksman, these mecha are dangerous from places many wouldn't expect a mecha to attempt to engage from.
Japan
A new competitor in mecha, this country has a gift for light, powerful designs.
A28 Shinden
-16 tons
-3x Type 3 machine guns
-Crew: Pilot, Gunner/Mechanic
Notes: A late entry into the mecha arms race, the Shinden doesn't seem much, until the question of endurance comes up. Equiped with piles of ammo and a bounty of fuel, the Shinden can stay operation in the field for days at a time. Frequently, pilots will add additional weapons, including Bangalore torpedoes, grapel launchers, flare projectors, and on one notable instance a flamethrower.
France
A well-regarded mecha designer, this country frequently fights with itself over what constitutes ideal design
M.1917 Araignée
-35 tons
-1x 37mm gun, 4x Hotchkiss Portative machine guns
-Crew: Pilot, Gunner, Machine Gunner/Loader, Machine Gunner/Loader
Notes: The first hexapod mecha, and still one of the best armored mecha available in regimental strength. Recent refits to the M1925 standard make this old spider a far more dangerous threat than many would expect, however, and few underestimate the vehicles resilience twice.
M.1918 Lièvre
-10 tons
-2x Hotchkiss Portative machine guns
-Crew: Pilot, Gunner
Notes: A light reconnaissance mecha, the Lièvre was the first dedicated artillery spotting platform designed and built as a motorized unit. While not incredibly dangerous like her big brother, the French obsession with terrain crossing is visable here as this mech can cross any broken country with ease.
M.1926 Requin
-16 tons
-2x Hotchkiss Portative machine guns
-Crew: Pilot
Notes: A move away from multi-crewed mecha, the Requin looks in large part like the Lièvre, until one discovers the unmanned upper weapons position is actually controlled from the cockpit. While most consider it a curiosity, the future implications of this are quite important, considering the fact discussion has been made on several occasions of slaving heavier weapons to the system.
M.1927 Fourmi
-20 tons
-1x Hotchkiss Light machine gun
-Crew: Pilot, Gunner
Notes: A move back towards the tradition of the Araignée in its hexapod leg configuration, this mecha is actually far more kin to the light Requin and Lièvre designs. Armed primarily with a radio, this heavy scout mecha is impossible to dislodge once planted, and has the terrifying trait of being neigh-impossible to confirm kills on: especially as a 'dead' unit will frequently still be radioing in corrections to a barrage.