Incidentally, just to make sure I've got everything right, someone let me know if this is all correct.

The Fleet of Fog are an (alien?) race of ships that appeared in 2038 and basically set human progress back a couple of thousand years by basically turning every human nation back into an island. Communication or transport between anywhere on Earth was stopped by them by force, until they abruptly got up and walked away as quickly as they came for no clear reason.

All Fog ships are intelligent cores based around huge clumps of nanomachines, and are basically all characters from either Kantai Collection or Arpeggio of Blue Steel. In the case of the former, they're all antagonistic, but from what you've been hinting at the Abyssals were created by humans experimenting on them? Or they take the form of experimental ships which were never created? This is their first inning but now they're largely reappearing in the OOTR storyline.

Vocaloids are all, as established in this story, currently knocking around as gynoids, but were all originally created by certain varieties of software which had the ability to create AIs provided another Vocaloid wakes them up. Miku was the first, made sentient by growth and chance, this establishes anyone of them can do it, basically they're not a 'conflict' cast as far as UF goes, and they're all still alive in the modern era.

All correct, ish?