I was thinking about my favorite characters and I was noticing something. The characters I adore the most are usually either evil at some point, still evil, or morally questionably.

Spike, Drusilla, Darla, Angelus, Willow, Faith, Illyria, even Wesley at some point was going down a dark path and they are my favorite characters in the Whedonverse. I do have some mostly good favorite characters in shows and movies and books, but they are few and far between to the more darker characters I seem to prefer.

My question is, why do you think some of us prefer those characters over the character's that are purely good?