I raised this point with a friend of mine earlier today.
Whilst DT and CE are very different doctors, they are both largely similar in that they are young and very energetic and easily excitable. They also have a sibling/best friend relationship with their companion...
I have no problem with this what so ever, and I'm looking forward to DT's main performance.
With the relaunch of this show, and the fact its trying to attract a younger audiance (just compare the new novels to the 8th doctor ones for verification on this) are we going to be having a young and energeticic "matey" doctor from now on?
During the classic series, there were many doctors who took on a more light hearted and sibling esque role, Patrick Troughton arguably (though not so much), Tom Baker and possibly Peter Davison, though Im not too familiar with him. There were also doctors that were more paternal, resembling an uncle or God-father. These had a very different dynamic on screen and were much more of an authority figure.
Do you think it's possible the Who series might return to having an authority figure as a doctor? Another middle aged, yet fantastic actor? Anyone from Richard E Grant to Bill Nighy (who were both considered for 10th doctor, for those who don't know, Nighy played the Stepdad in "Shaun of the Dead" and the aging rockstar in "love actually").