I'd really love some stories where one of the characters is split. Especially Spike's demon or demon side being split away as a separate entity (whether or not this leaves Spike as William or slightly changed or very different). Not limited to, but like how Xander was split in The Replacement by the Toth demon's staff. Thanks a lot!
Half and Half by Eternal_red
On discovering Spike has returned from the dead, Buffy heads to LA to be with her chosen one. It must be a Tuesday because her timing is off and, before a slight misunderstanding can be resolved, all hell breaks loose. Really. A take on the old 'trapped in a haunted house' scenario - only with fewer cobwebs and a dash of Jekyll and Hyde thrown in - this tale blithely tramples over Angel Season 5 from the outset.
Found on Bloodshedverse, this is so far incomplete, but an amazing read. The view of the demon is very unique, and the plot is original, but it's our beloved characters trying to work it all out. Strongly recommended.
Split Personalities by PassionFish
An evil demon comes to SunnyHell to hand our favourite Vampire and Slayer duo a severe case of split personalities!
TimeLine :: Not set in any season, just assume Spike is chipped and helping....reluctantly.
Found on BSV, only four chapters, but fun and smutty.
Vampire Instincts by tania15
Rewrite of the episode the replacement in season 5. Spike get hit with Toth`s magical blast instead of Xander. Oddly enough the previous seems terrified of this for some reason. So he should because the magical does not seem to affect vampires in the same way as it does with humains. Add on the fact that Spike isn`t your average vampire and you got yourself some trouble.
Found here on Spuffy Realm, WIP but an interesting new idea for the Replacement, even if it didn't have the chance to explore all the possibilities. | 
