Matt Smith recently announced that he could very likely be leaving the show after season seven. The fact that the S7 arc contains "The Fall of the Eleventh" leads me to believe this is fairly likely, so my question is: what personality type do you think would be best fit the Twelfth Doctor? 9 was a war hero who softened over the course of season 1, 10 had stirrings of what the Time Lords had become, and 11 was a very "childish" (note: I mean playful, not juvenile) man who could very easily switch to serious mode. What would you want to see next? I personally would like for maybe a Doctor who begins to show his age a bit after all that he's gone through.
Note: Please keep any sort of Matt hating out of this. This includes wishing for Tennant to be back. It may be your opinion, but its not the purpose of the thread.