It's the bad guys that drive the story. Some more than others. Some I really love to hate. Some of these villains are great multi-dimensional characters that don't always make the sexy spotlight just because they're the antagonist. Let's start a thread on your favorite baddies.
I'll go first. >_>
I actually have 3. The first is Aku from Samurai Jack
. For being the grand evil shapeshifting master of darkness, Aku ironically relies upon the foiled attempts of minions to take out Samurai Jack -- which makes for some pretty good comic relief.
The second is Hisoka from Hunter x Hunter
. What I love about this guy is that, like his nen type states, he's unpredictable. While the other villains and protagonists of the anime may have clear motives and goals, Hisoka likes to keep you guessing. He receives some sort of erotic satisfaction from killing difficult opponents, which makes for excellent antagonist material. I honestly follow hunterxhunter just so I can see how Hisoka prepares Gon to become his next meal.
Lastly, there's this silly guy in an orange mask who appears to have more nefarious goals than his outward persona appears to let on...