Oh man. I actually know a lot more interesting villains than I do heroes. Does that say something about art these days or is it just me?
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To start, I'm gonna go with a straight up bad guy. The idea of him is rather unoriginal in general but BRILLIANT in everything else that counts as far as an actual character goes.
This guy:
When he was first introduced in the Sorcerers Stone, he was pretty standard as far as bad guys go but he still had a little bit of mystery about him. Chamber of Secrets then expounded some more upon him but it wasn't until the Half-Blood Prince where we finally see him shine as a true villain. The Orphanage scene is especially enlightening. So in the end, what makes him an awesome villain? For me, not only is he incredibly smart, he knows how to get others to loyally support him, to wheedle out information from someone, and above all, to be as cold and as tough as hardened steel always.
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Next in line is Venom. But NOT as a character. As a corrupting influence.
Now, IMO, this is as pure of a "demon inside" sort of deal as one can get. It throws into the limelight the choices that everyone with power must make. It shows the rush of pleasure gained from abuse of said power but it also shows the terrible consequences of choosing such. That, sooner or later, you will push everyone away and it will eat you up inside until there is nothing left. So, all in all, a really nice break away from the usual villains we see. And it tackles an issue in real life that's not brought up very often. Sometimes, the real villain is you.
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Last, but not least, is Lord Cutler Beckett
Seriously. Just look at this guy. He's a boss, through and through, navigating with style and applaud. But of course, the style doesn't make the man. Not to worry because Mr Lord Beckett is one of the best tacticians rivaling and even, dare I say it, surpassing ol' Captain Jack himself. You see, I have more respect for Beckett because he doesn't rely on sheer luck as Sparrow does. Captain Jack likes to make it all up as he goes along and he makes it all up nicely. But that's the problem. He's still going from moment to moment. Realistically, Beckett should have won, but oh well. Movies are still Grade-A.