With a pod no early than 1880, how can we get a world war with a country other than Germany as the main "bad guy"?
Like, could there be a world where Britain or France rather than Germany are the 'enemy' ruled by a genocidal megalomaniac that are then crushed by the allies? Maybe Russia? Hell, maybe even a non European country like China?
Is this plausible? Or is Germany just uniquely suited to fill such a position?
To be honest, it is very difficult with an 1880 POD.
You can't really have Britain as the antagoniser. They were the "number one" world power, who had built the international political system around itself for most of the 19th century, so were the "status quo" country who would defend the current order, not try to rock the boat.
An 1880 POD for France is too late given their relative decline against the other powers.
Russia, China and the US are certainly possibilities, as they are all large countries with the potential to shake up the order, but you would need major changes to their domestic politics (and in Russia and China's case, it's economic development) to be antagonisers. However, they also all had large land areas, plentiful natural resources and agriculture, and could dominate in their own backyards, so were not really chasing a "place in the sun" like Germany was.
Japan's power limited it to being a regional "bad guy".
And Germany was in a unique position, it was an economically developed power like the Western democracies, but it had a political system that allowed for it to become the way it was. The other world powers either had developed economies with democratic political systems, so were less prone to starting a World War, or were autocratic countries that were too weak and under developed to start a costly World War.
Germany was in the unique situation of having all of this - the economic strength of the democracies and a political system that gave the Kaiser enough control to impose his will on the world in a less responsible manner than a democracy would.