I think it's Kabuto. Kabuto is cautious and plans everything. He actually has some subtle sense of humor. In the anime despite Itachi saying several times "you will die here" Kabuto kept smiling and didn't react to it. (I actually laughed histerically at this) Madara, Orochimaru, and all of them left us in the dark about what they were planning but Kabuto makes sense of everything and makes the story easy to follow. He also isn't afraid of admitting if someone is stronger than him.
And his back story... You can honestly tell why he did what he did. My second which comes close is Madara who represents the epitome of all evil in naruto. But Kabuto started out from nothing and worked his way up.
And his back story... You can honestly tell why he did what he did. My second which comes close is Madara who represents the epitome of all evil in naruto. But Kabuto started out from nothing and worked his way up.