Fake Name will always hold a special place in my heart as one of the first character trolls. The Popes are lots of fun. Sexxyness and RainbowBrite deserve special mention. But my favorite troll is...a member that people don't even realize is a troll. I feel honored to be "in the know", and it's a secret I will take to my grave.
(No, it's not anyone that you all know well, so don't get paranoid. )