You know this actually does make sense. He's never been a ginger, but has always wanted to be. Poor old Doctor, that's what hair dye is for. In all seriousness, what if there's a real Doctor and he's actually a ginger.
We all change when you think about it. We’re all different people all through our lives. And that’s OK, that’s good, you’ve got to keep moving, so long as you remember all the people that you used to be. - Doctor Who quote
Quote from Dr Who: Rose Tyler: I am the Bad Wolf. I create myself. [Rose lifts her hand and takes the words from the Bad Wolf Corporation sign] Rose Tyler: .I scatter them, in time and space. [the words float off away from them] Rose
I loved Rose but, I also liked Martha. I'm not saying that I thought she and the Doctor belonged together or anything, but as a companion I thought that she was awesome. (Be honest- if you were travelling with the Doctor you'd be in love with him, too.
"The only way to get rid of her is to send her into a parallel world from which she can never return; otherwise she would stay with the doctor forever. We can't get rid of Rose. So, lets send her parllel universe !