You'll see many of these realms explored further in upcoming chatpers of my webcomic.
You can read my webcomic Tales of the Otherfolk here: www.webtoons.com/en/challenge/…
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So I take it that the fact the Germanic otherfolk are occupying the area's around Mount Olympus means that any Greek/Roman deities or mythical creatures of great power are dead and gone (if they aren't currently in Amazonia or Atlantis)?
The mythical creatures of ancient Greece and Rome still exist and thrive (except for the monsters killed by the heroes of old). The Olympian gods technically don't dwell here in the Otherworld, but rather up in their own abode in the Heavens.
Things that are not of Olympus or the Underworld, that can't be found anywhere in the real world, reside here (Atlantis and Amazonia for example).