Adding a bit: isnt there also the possibility of people truly believing in multiverses (theres a better word for that I can’t think of it right now)? In doing so, creatures, persons, beings could actually exist somewhere, and would fall into otherkin. For example, if you’re miss kobayashi’s dragon maid, thats a dragon person, which certainly could be considered kin.
Elves also are known to come from other worlds, and so are types of energy beings. I hear it often where they experience a level of homesickness. Worse, there aren’t many resources for fiction kin to reference outside of books ans shows. I can imagine it might give a layer of ‘who am I outside of the world everyone else knows?’
I’d even say that many Otherkin research themselves (and even discover things about who they are) through books and maths, which isn’t too different than how fictionkin find connection within modern stories. Theres no guarantee that this isnt some au ou there…
And like what @
darksou said, I could influence parts of them.
I’ll stop here I’m not well versed in this and I might have just spewd toilet water…
Dang it @Aarden, 4 minutes faster and now it sound every odder!
Edit: forgot some a’s…