That intensity and darkness about him you get to see a little bit in series seven but there's enough silliness to go around. It shows how well Smith can portray the Doctor, being able to switch so easily.
Yeah Tennant is fairly awesome. He was the first Doctor I watched so that's why he's my favourite. Smith's Doctor is totally different though, but yeah he is fairly flawless in his portrayal. Definitely has the potential to be one of the darkest Doctor's, but also very childish and playful.
Ah I see, series seven is pretty good overall. Series six has a few of my favourite episodes in it. Series seven is amping up the game on a few episodes. Smith is definitely growing on me more and more but Tennant will always be my Doctor.
The character that I RP with the most has an ancestor who fought in the Unovan Civil War. He was exiled during the closing days of the war. I don't really have much else to go on right now because most of the time when he is spoken of, it is what he did after his exiling. But the stuff that came after the exiling won't be relevant to your RPG.