6. Rose Tyler
Ever had one of those romantic relationships that began promisingly, but over time compelled you to confront the fact that the other person really wasn't letting you in? Was that person initially gushing, warm and accepting, yet as you got closer turned out to be detached and seemingly preoccupied with things other than you? Well, that's The Doctor all over and it's no use saying it was simply the tenth's way. Of all his incarnations the tenth was if anything the most human, concerning himself with humanitarian issues at every turn to an extent that none of the others ever did. Rose Tyler is just the starkest reminder of what The Doctor is at heart. At best The Doctor has always avoided attachment to others. At worst, now that we have seen him over hundreds of years of development, I think it is fair to say that he is pathological about it to the point where he could be characterised as having a schizoid personality disorder. Think about this before you try and excuse him by saying he's just an introverted, shy type that hasn't had time to form lasting friendships due to being occupied all the time with saving the universe and all. Sorry, but he's hardly in that class and in any case being shy and retiring in your natural outlook doesn't mean you are maladjusted or in any way dysfunctional. My not very startling theory is that this type of disorder is usually associated with failing to form proper bonds with your parents at an early stage in life, especially dare I say your mother. You never hear or see anything of her, do you? Think on it, that's all...