@AfroSamurai:
You know what? I want One Piece to have just ONE troll character. You know, like Aizen, or Kumagawa, one of those characters that trolls the reader completely, leaving him with a big "WHA–". Just one, and for a short arc, but there should be at least one troll in the One Piece world, who trolls his way through the strawhat's ranks and then trolls the reader too.
Well, that's just my idea, although I may be biased by having just read Medaka Box...
Law was like that for a little bit, Akainu too when he killed Ace.
The thing with Aizen was that while he made reading Bleach entertaining, it was for all the wrong reasons. Sure it was lulzy for him to turn in a butterfly and say that EVERYTHING WAS ACCORDING TO PLAN SINCE YOU WERE BORN, but he was pretty terrible as an actual character.
And Kumagawa's just a diamond among dirt. If One Piece had a Kumagawa, he'd be fun, but he wouldn't stand out half as much as he does in Medaka Box. He'd also have to be plot relevant, since Oda wouldn't have a character make that much impact and then ditch him entirely.