* The (in)famous ''Yet Another Halloween Fic'' sub-genre of fanfiction, in which Xander (and possibly other characters) choose a different outfit for the fateful Halloween when Ethan Rayne [[BecomingTheCostume turned everyone into their costumes]]. Invariably, these will be the costumes of recognizable characters, particularly from anime.
* What might be termed the "Slayer Speculation Fic", in which the famous, strong female character of the author's choice from another fandom is called as a Slayer by Willow's spell in the series finale.
* A number of stories portray Xander as still having the essence of the hyena spirit inside of him. [[SlashFic It seems to often draw him to Oz or Spike,]] one being a werewolf, the other being a dominant predator.
* There are three standard Willow/Tara plots:
** 1) Rewrite season four to show all the details of how Willow and Tara fell in love. (The TV show didn't show this.)
** 2) [[FixFic Rewrite season six so that Tara doesn't die.]]
** 3) [[HesJustHiding A post-season six story in which Tara comes back from the dead.]]
* ''Buffy'' and ''{{Series/Firefly}}'' is such a CommonCrossover that such stories have their own tropes (and considering the amount of 'Verse slang that pops up in the future-Slayer comic ''Fray'', some fans wonder when Joss is going to declare that world to be Earth-That-Was and get it over with). For example:
** Book is (or was) a Watcher. {{Jossed}}. Not that it needed to be...
** River is a Slayer, and the Academy was a corrupt version of the Watcher's Council. (Well, more corrupt than usual.)
** Rarely will more than one or two of the Scooby Gang feature, and it's usually Xander or Willow transported to the future/an alternate dimension via magical portal or suspended animation or an unaging Buffy and Faith
** Xander is an enormous Badass, since he only has normal humans to fight, and has spent his life surviving against creatures at least twice as fast and strong as he is.
** Mal will be mistaken for Caleb. Zoe and Jayne's resemblance to [[Series/{{Angel}} Jasmine and Hamilton]] may also be brought up, but this occurs less frequently.
* Rewrites of season 1-4 episodes to include Dawn, or specifically [[CosmicRetcon the altered memories of the cast that include Dawn]].
* Rewrite of season 6 to bring Faith back after Buffy's death at the end of season 5. Usually serves to set up a Buffy/Faith pairing after Buffy's resurrection, but there are other pairings and directions that the plot can take.