In your own space, share your love for a trope, cliché, kink, motif, or theme. (More than one is okay, too.) Tell us about it, tell us why you love it, give us some examples and recs. Leave a comment in this post saying you did it. Include a link to your post if you feel comfortable doing so.
Ever since I tried writing one last year, I've felt pretty attached to the Daemon AU. That's the one that borrows the concept of animal souls from the His Dark Materials trilogy, which presumably has a fandom of its own, but I'm only interested in one aspect of the setting.
I've said a few times, and it's still true, that I'm not interested in reading fanfiction lately, so it surprises me when I get curious enough about anything to look up fic for it. But I've done just that with the Daemon AU tag (linked above): scroll and scroll until I find one that crosses over with one of my fandoms. Even if the summary doesn't look that good, I'll open it up 99% of the time just because I need to know what species and names other writers have chosen for my favorite characters's daemons.
I think the appeal of everyone having an animal sidekick representing the soul is pretty obvious, but oddly, it's the rules that really seal it for me. The change at puberty, the gender question, the NO TOUCHY - all of them compound the metaphor and add all kinds of potential observations and situations. Almost any kind of setting can adapt to the addition of daemons, but it's only a Daemon AU when the writer has a handle on the limitations of the physical spirit and employs the mythology in interesting ways.
Stranger yet, I'm realizing that this actually does count as a kink as well as a trope, not because anyone uses daemons in sex but because they allow you to write G-rated sex scenes which are genuinely kinda hot. It's not metaphorical when canon states that it causes an emotional sensation intense enough to be physical. I like that idea, picturing it and writing it, imagining a character like Buffy cradling Angel's daemon as they both cry it out.
As far as I know, nobody on my flist has much interest in this trope, which of course is fine. But you may see more of it from me in the future, or you may want to make me really happy someday and write me a little bit of it. :)