The Set of Worlds
The Set of Worlds is exactly what it sounds like. Various worlds from throughout the universe are connected by magic, a system that has become the norm for most life in a majority of its worlds. The Set is not the only thing in this universe, however, as is realized by the existence of an entity known for its clicking noises.
Worlds described as being "outside the Set" are, in fact, indirectly connected to the Set of Worlds. Worlds described as being "outside the clicky thing" are completely separate and do not share the Set's signature magic system.
All subfolders labelled "The World of..." in their descriptions are part of the Set.
The unsorted subfolder includes characters from the same story as Ocean. Not all of them originate from the Set, but they are now involved with it.
Other folders involving the Set include:
Favorites (The World of Moonlit Waters + an external world)
One (The World of ???)
CUE (The World of Falling Skies / Ikan + an external world)
Sun of Death (Myth, Soguriri ro de Rusurai-sa)
The First Leaders in the Set of Worlds come from the World of Origins, named uniquely for its place in the Set's history. They lead the fight against the Shadows in the First Shadow War.
Teran and Hunaria are countries in a world outside of the Set. As far as history goes, Hunaria was initially discovered and became related to the Set because of Thrynll. It is the origin of the second most common language in the Set, Hunarian, and is also where all direct line members' heritage originates.
This world outside the Set houses the Light Kingdom and surrounding territories. Akira, Kusari, and Aoi are from here, and all characters in that folder live in the Light Kingdom.
Characters here are significant, but their origin doesn't have enough characters or development for their own subfolder.
All subfolders are worlds in the Set that aren't as prioritized / focused on.