Spike (Buffy the Vampire Slayer)

Spike is a 220 year old vampire, and possibly one of the fear most notorious. Originally known as William, he met a girl named Drusilla who turned him into a vampire. Spike met Angelus, a sadistic vampire who taught Spike everything he knows. Spike is famous for killing two slayers, one in 1899 and the other in 1977. He initially hates Buffy, but eventually has erotic dreams about her, realizing that he is in love with her. He becomes a close ally to her group and eventually becomes her lover for a brief time, before she ultimately agrees its for the best to end the relationship. Still a close ally, he ultimately sacrifices himself to save the world in an attempt to stop the First Evil. He is resurrected by Angel, an ensouled now reformed incarnation of Angelus, and aids him in his work in bringing down Wolfram & Hart, a company that serves all that is evil, from the inside as one of its CEO's.