I'd say that I'm closest to the ninth doctor. He acts all cheerful but there is a deeply conflicted man beneath his facade of joviality who is capable of being quite ruthless as you can see in the episode Dalek. Also, he likes to act stupid or plays so that others will underestimate him, but really he is a quick thinker who can find his way out of almost every situation.
Also, he says fantastic a lot and that is one of my most used words.