That lack of control is precisly why anything could happen. All the doctor's regens have been white and male, but beyond that they are all over the place in looks, age, and personality...Redryhno said:It's been alluded to that he has no control over it beyond regrowing a hand or something very minor the last 6 hours of a regen cycle.Vault101 said:2000 years of living as a man..there's your reason doctor wants to try something different (assuming he/she has control over the regen process)Zontar said:This seems like a very "you can, but should you" type of situation. In-universe it makes no sense (2000 years of living as a man doesn't exactly lead to there being a logical reason for such a change) .
I wouldn't exactly call that a stable or consistent thing... And with the wild swings in personality involved, you couldn't really even argue that 2000 years of being a man would influence a female doctor's behaviour all that much either...
But... I agree with some of the other posters here... Moffat's writing could make this a rather bad idea right now...