The bad guy who enjoys being who and what he is is hardly a Buffy invention, but it’s something this show needed. And Spike, despite Giles’ later discovery of the history of his name (note: we never actually see him use railroad spikes on anyone), isn’t just living for torture and biting people and random cruelty. Sure, he might enjoy a spot of it now and again. But he’ll enjoy other things, too. Like Drusilla.