Hey umm i have noticed somethings, first why is Germany able to see the dead so easily even thought he doesn’t seem to have any supernatural abilities?(I know they might be visiting him but all visits we have seen (like from Rome) are usually on dreams). And if HRE is dead and not Germany why hasn’t he tried to visit Italy? technically if he is dead he could be able to do it.

So
much to break down, so I’ll try to be concise. (I can’t remember which post I already
wrote all this in).

Rome
visits the Italy brothers in their dreams, but Germany is the exception. That visit
takes place when the latter is awake.

Source: Hetarchive, Grandpa Rome’s Visit Home.

As
for the supernatural thing: I think that’s a purposeful complexity of Germany’s
character.

There’s
the irony of a supernatural “strange being” strongly believing in empiricism and
scientific fact. While Germany is quick to discount ghosts, the fact that he
sees them is important.

Source: Hetascanlations, World Stars Chapter 1 + Hetarchive, Comic Diary 8.

Nations
don’t see ghosts unless they believe in them as a result of their people
holding these same beliefs. We’ve seen this with Japan, who lost his ability to
see youkai and other supernatural beings during the Meiji era. Longer post here
[x].

In
other words, if Germany sees them, the logic in the manga follows that he must believe
in them, regardless of how much he verbally discredits it.

For example: Even though he waves
off Quintillus—a Roman emperor—as a boy and not who he openly claims to be,
Germany refers to Quintillus as Roman afterwards. It doesn’t seem to be put sarcastically either.

If anything, on top of
revealing that Germany may have actually recognized Quintillus as a spirit,
this also ties in with the fact that Germany’s interest in Roman history is
putting him along a trajectory of recovering his roots; that is, if he is Holy
Rome.

Source: Hetascanlations, World Stars Chapter 41.

Since
we know that nations who have passed on live in heaven, Holy Rome not visiting
Italy supports the idea that he never died and had instead lived on to adopt
the title of Germany, albeit possessing no memory of his past life. 

Chapter 1
of World Stars states that during title changes, it’s possible for the personification
to adopt a new personality. Since personality is heavily influenced by memory,
it could just be that the personality change is Germany losing his past
memories.