I'm here to pimp an important document in the history of fanfic, a remarkable collaborative tome that gave a minor Buffyverse character a last name and became part of the 'verse's cannon - Lydia Chalmers'
Thesis on William the Bloody If you haven't read
spikendru's backstory of a watcher,
In Search of Spike I suggest you do. It's all her fault what reminded me of the 'thesis' in the first place.