I nominate TMAN for his humor, sarcasm, and vitriol. He's the first member that came to mind, but I'll try to think of some others.
Edit: Bruno, definitely. He hasn't been active lately, but he's definitely entertaining. Spoetnik was also pretty funny/psychotic, but I think he quit the forum.
The legend of Bruno is alive and well, he is hard at work getting our ICO off the ground.
Speaking with him everyday and I still can't work out all his crazy sayings, hugely entertaining dude!!