Ok who thinks they have a great character and If you do say so here and we could have a little battle. Then later we could see who has the best character on this whole board! (Of course without cheating)

jon you know i want to fight you but you know too that i have the spanish version. Well, i suppose that when i get NWN i will have to buy the english version je je

Like so many already have said before, it's all about tactic and how you use the party. The question should be, what is the best party. But then again it's individual. We should make a real multiplayer-tournament. Everyone makes their party and plays with it until they have reach a certain amount of experience. Then they challenge each other and see who is the last man standing.

It's not fair to talk about the best character, since I can't stand a chance against any figher or mage with my kensai/thief. Well, maybe I could defeat a fighter with some invisibility potions, and maybe even a mage, but it depends on how far from each other the characters are. Hmm, any more factors that I haven't mentioned?

If the playing field is a small, well-lit arena where one cannot escape the sight of the other, a fighter or mage will win. If the playing field is a dark maze of twisty little passages (all alike), a thief will eat the others for lunch. There are probably arenas in which an archer would rule all -- dark and full of barriers which do not obscure vision, perhaps.

Hmm...
Well.
Would the XP cap remover be 'cheating'?
A level 20+ Sorceror is typically unstoppable with spelltriggers and chain contingency.

Multiple--yes.
I suggest the little pit arena in the Copper Coronet. Fairly small area. Or perhaps the D'Arness courtyard?

I don't think you can pit party vs. party. The best you can do is 3 v 3.