This thesis is based on Lydia the Watcher's line in the episode "Checkpoint" (Buffy Season 5). On first meeting Spike she says in awe, "I wrote my thesis on you!"
UK magazine SFX conducted its 21st century’s top 100 sci-fi icons contest a few months ago.
Complete list with the top 100 and the other Buffy the Vampire Slayer cast members ranking.