The countries have three golden, unspoken rules that they follow without need to be told.

1. Be open to other religions, seeming their all pretty divided with religious beliefs.

2. Don't hold grudges because of what they had to do in the past. (Examples: don't blame Alfred for nuclear warfare, don't blame Ludwig for various types of genocide)

3. Never mock the humans that they were once close to. It will get them pissed beyond belief.