And you know what, I'll do Germany. I grew up there and I speak German, and no one has done it yet.
Leader : Yep. Friedrich II would also be acceptable, but Bismarck is a no-brainer. One of the great statesmen of the XIXth century, and the major influence on the unification of Germany (props to Napoleon III for his stupidity though, that also helped
)
UA: I don't really get this. I mean yes, the Germanic barbarians are very famous, but why the conversion thing ? The reduced maintenance doesn't make that much sense either, it should be something to do with Discipline or earning XP faster, because that's what the German armies were know for in the modern/contemporary era.
UU: Panzer is good, the other option would be the U-Boat I think, or something Prussian. But I don't know what the Prussians have that was very specific, they were mostly known for their discipline and competence.
UB: Hanse. That's excellent. It gives a very unique flavor to Germany, and the Hanse is a huge part of the history of the region. It's also a nod to the fact that, during many centuries, Germany was composed of many city-states. It's also good to have an economic aspect to Germany, given that it is their biggest strength since WWII. A unique Factory would also have been appropriate in that regard, but I'm not sure how I'd name it.
You could say that it's very North-centric (Bismarck was Prussian, the Hanse was about coastal cities in the North Sea and the Baltic, a lot of which were/are not German). The thing I would change for that is to have a UA related to city states and maybe religion called "Holy Roman Empire".