Buffy The Vampire Slayer

When Spike first hit Sunnydale (or, more accurately, hit the Sunnydale sign), he was bad as can be. No sparkly vampire was William the Bloody. He was dangerous, murderous, and madly in love with batshit crazy Druscilla. By the fourth season of Buffy the Vampire Slayer, Spike had been captured by The Initiative and had a chip implanted in his head to curb his violent tendencies; whenever he brought harm to a human, he experienced agonizing pain. In the midst of one adventure, Spike realized that he could strike demons with impunity. Thus, he began to hang with Buffy’s gang.

However, over time, Spike found himself falling for the slayer herself. Needless to say, drama, hurt, and building-wrecking sex followed. Spike went so far as to fight to get his soul back before sacrificing himself to save the world at the close of the final season of the show. Thanks to outside intervention, Spike found himself alive again on "Angel" the next season. Surviving that group’s own apocalypse and stint and hell, Spike recently aided Buffy and her army at the close of the "Season 8" comic series.