For the uninitiated, Yuletide is a fanfiction gift exchange - see http://yuletide-admin.livejournal.com/ for more details.
For bonus confusion - I'm 'kastaka' on AO3 :-).
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My requests this year:
Changeling: The Lost
Optional Details: Someone's initial escape from Arcadia - or maybe just a slice of life from them still trapped there, or something reminding them of what it was like, or returning to somewhere they knew there?
Dwarf Fortress
Optional Details: Tell me the story of (part of, or all of if you're feeling ambitious!) your actual game - or someone's Let's Play - in all its twisty turny detail? Or if you're feeling like writing on a more personal level, pick one dwarf and follow their adventure through a game? Or maybe pen the venerable and ancient Saga of the Carp :-).
Snow Crash - Neal Stephenson
Characters: Y.T.
Optional Details: So, what happens next? Or maybe a tale of an exciting everyday courier job, before everything kicks off...
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General additional detail stuff:
I am pretty much a terrible person when it comes to fanfiction - dark / controversial / awful themes don't bother and indeed generally please me - especially if you're going for the Changeling prompt.
I'm not massively interested in fluffy relationship stuff (or teh sexing) for the sake of it (although in pursuit of a theme / for character development etc it's all good!).
If you're doing Dwarf Fortress fic, despite the foregoing I would be quite happy with a light-hearted feel rather than necessarily something that takes itself one hundred percent seriously - don't feel you have to be joke-a-minute, but don't feel you need to write a gritty realistic tale of horror either (unless that's what you feel like doing!).
And for Snow Crash, if you're touching on that area I generally prefer to see Y.T.'s 'relationship' with Raven as a positive experience rather than a negative thing / a generator of trauma. A rip-roaring adventure without too many dark shadows is also great here if that's your kind of thing :-).
I'm not that keen on holiday-themed fic; if you like to use that as a starter that's fine, but don't feel you need to shoe-horn in any holiday elements. Similarly, I prefer stories to stick reasonably closely to canon rather than changing things for changing things' sake (although I think the canons that I've picked are pretty broad anyway!).