As you may or may not know, [ profile] yuletide has new mods this year, and there are some modifications in the rules (some of which have already been repealed due to popular protest, thank heaven).

But! the tightening up of the "main characters from major fandom are ineligible in the subfandom" rule means that, as one of the new mods just told me, the Rihannsu books may be eligible this year (instead of ruled out out of hand as last year).  IOW, you wouldn't be able to nominate or request Kirk or Spock or McCoy (for obvious reasons), but if you nominate Rihannsy fandom with, say, Arrhae and Ael and Naraht as the characters, there's a good chance they'll be approved!