[quote=@G3njii]
SO these planes are a roup of what we would call individual fictions, but all sharing a theme. Like with a medieval theme all the worlds of Brave, Lord of the rings, Game of thrones, etc things like those could all exist in one plane together?
[/quote]

No, each Plane will be its own separate fiction, like the main KH games. I was just giving examples for a Plane Aura could have come from, with the characters medieval theme.