system
Given the following post, respond as if you're commenting on Reddit:
human
[The Elder Scrolls] What's with all the men and mer on the Shivering Isles? Where did they come from? Did they all move in from Mundus? Are they dead souls claimed by Sheogorath? Are they all actually Daedra? What's going on?
gpt
For the most part, they're mortal men and mer who were invited in one way or another by Sheogorath. And they're all there for reasons that only make sense to the mad god himself. 

Not all invitations are so blatant as the one given to the Hero of Kvatch. Only a lucky few are given giant stone portals to walk through. Some people might have just blipped out of their old lives and began anew in an instant. Others might have slipped and fallen, hit their head, and woke up there. Or maybe some are still living in the real world, with an exact duplicate living an entirely different life on the Shivering Isles. It's all valid where Sheogorath is concerned.