From Buffy the Vampire Slayer, Spike was funny, hard, direct, and absolutely nice. A kind of rebel challenging everyone around him, covers a wide range of situations and emotions. And he said one of the lines I like the most from a vampire character: “If every vampire who said he was at the Crucifixion was actually there, it would have looked like Woodstock.”
A favorite of many, you can find a fine approach of him in Billie Doux reviews, where I found the transcription of the quote.
Spike also appeared in Angel, a TV series related to Buffy.