From where I stand, the two most robust fictional universes are Tolkien's Middle Earth, and Star Trek's universe. While other universes may have its own lore and beloved characters, not many have most (if not all) of its inhabitants' cultures and geography totally mapped out, from their daily attire to formal dresses, languages, greetings, every nook and crannies of every villages and the deepest crevices on every hill and dale. Heck, even their entertainments and mediums have all the rules clearly laid out!
In your experience, which of the two, or something else entirely, comes up on top as far as being an actual universe.
In your experience, which of the two, or something else entirely, comes up on top as far as being an actual universe.