I also have not much experience with Hetalia, but this sounds fair enough not to mention pretty awesome.

Immortality though... I guess that has to do with how strong the bond can be between Discedo and their home countries. But having citizens here should give them a boost.

BUT THE IMPORTANT THING I WANTED TO SAY WAS I read "Babbymerica" and all I could think of was Soldier having to babysit. XD