Mine is Obito.
Why? Because of his character depth and development. He's been revealed to be insane in so many ways. Like how he won't except that Kakashi isn't an imposter, and Rin, and everyone else in the ninja world. I also can relate to his hatred of society. His character development was spot on. When he saw Rin die, he realized he has lost everything, and he started not to care for anyone, including himself. The fact that he used ALL of the members of akatsuki and Sasuke as pawns is also one of the reason why I love his character.