I'm going with the crowd on this so it's Halsin. He's just boring and I in general dislike tree huggers. Astarion would be my second choice as I can't stand his squeaky voice but he has an interesting story.
I'm surprised so many people dislike Wyll. He's sucha do-gooder it's comical but he has a very interesting story and he comes in a pack with Mizora and Mizora is my favorite character in the game.
