Prussia: A fairy. I’m not even sure why. Because demon is too obvious? And something about him being beautiful and charming and dangerous is very appealing… Also tht iron weakness. (Blood and iron kingdom. Haha. So siree.)
France: A siren. Does this need an explanation?
America: A vampire. Idk, this is something about strength and speed and beauty with multiple weakness to exploit… nah, it’s mostly about biting fetishes, right?
Canada: Some kinda… wendigo type thing. A person with antlers. A nature-y spirit. Becuase… Canada.
China: A dragon-person. This is terribly cliche isn’t it? But dragon people are super hella awesome and powerful.
England: A warlock. Ya know, so he can do black magic better. (What he is half of is subject to change.)
Russia: A something with ice powers. (A cryopath?) For reasons. (Actually he’s normally some kind of hunter of magical things [of whatever America is])
Germany: An incubus. ahahahahahahahahhahahahahahhahahahahahaaaa…