Let's see, I hated Grav, but I've gotten over that a while back. I hated The1, that will never change. Quikspy was a dick, hated him as well. Then we've got the newest addition Kuja's aka Nikolas. Oh yeah, and let's not forget Zagggon(he falls under the troll category, I hate all of them, Zonalon and the sort)

I probably hate The1 or Kuja's the most.