I wonder how a Command and Conquer: Red Alert style game would work.
Like, obviously there would probably be three factions from the start, rather than just two, namely the German Empire, Syndicalists, and the Entente, but how that would look in detail is a bit murkier.
German Empire, though it would probably have a different name (it would likely include Austria, Tzarist Russia, and maybe the Ottomans as well), I could imagine to be a weird hybrid of Iron Harvest's Saxony and WW2 Germany Military Stereotypes (Expensive, but effective units, with plenty of impractical, or highly situational super prototypes), all with a bit of a "Knightly", or at the least "Noble" theme. Their Early Tier Units, like Infantry Squads (Maybe called Stormtroopers?), would remain competitive well into the late game with the right Research, and their late tier would mostly be Units with new functions, rather than replacements.
In the Campaign, most of their named Generals probably have some gratuitous noble title, like "Kaiser Friedrich von Hessen", "Prinzessin Emma von Hohenstottern", or "Baron Katarina von Hausenbach", and so on, with the slight implication that most of them got their position due to their status, not their skill, and place an emphasis on "These poor people have been deprived of proper, noble leadership. Let's restore the natural order of things!".
Facion Symbol would likely be the Iron Cross, or a streamlined version of the Imperial Eagle.
Syndicalists are interesting. They'd be notable in that they "Level up", in that their higher tier units are pretty much just straight upgrades to their lower tier ones. Lower end units are dirt-cheap and spammable, little more than gun-armed Mobs (AK-47 for everyone!), IEDs, and improvised armored vehicles, representing their "Revolution" stage resembling the GLA, while Mid-Tier they take a more professionally-made look, with Mobs making room for (still rather large) trained Conscript Squads and Armored Cars, because they got established, while their High-Tier units are pretty much the equal of any comparable unit of the other two, where they are a proper fighting force, like the Syndicalist French Army. Think Early Tier: GLA, Late Tier: Soviets, and you get the idea, more or less.
In the Campaign, they would be all about "Let's redistribute all these riches to those that deserve it! For the Revolution!", with participation not being optional and often being forced at gunpoint. Their named Officers probably all have in common that they are mostly Lower Class, and probably that they are a bit out of depth. They are motivated, true, but really don't have the skills that would be necessary for their position, all while all having French or British Accents, with the odd American here and there, instead of being Russians.
I'm drawing a blank on the Entente though. Maybe their roster is middle of the road? Neither exceptional, nor crappy? I wonder what their gimmick would be. Maybe all their units are old, but powerful, but that would overlap a bit too much with the German Empire.
If a fourth Faction came along, it would have, no doubt, some sort of East-Asian, though primarily Chinese flavor, and for that looking at the Celestial Empire from the Red Alert 3 Corona Mod should do the trick. Rising Star, ready for a fight, with the odd Anime-esque unit (since China is apparently like Japan ITTL in that regard), with lots of weird high-tech units.