Bill/Ten
Yeah, well... what else do humans do entirely stupid things for? Oh, don't say that. Might be a bit of a clone, but he's definitely not anything like my dad. And in fairness, he did leave me with a bit of the TARDIS. Of course, I'm not sure if that was meant as a deliberate kick in the teeth, or if he'd just forgotten how long it would take to grow one from a bit of the coral, because it takes centuries. I might live a bit longer than a normal human, but certainly not centuries, and given how accident prone I am, I'm not entirely convinced I'll make it to old age regardless.
He'll not want to regenerate either. Oh, he'll probably act as if it isn't any big thing, but it is. It's not exactly just a change of face. I'm sure you've noticed that much already.
Oh, I bloody hate those... memetic types. Just inserting themselves into reality as we know it. Had to deal with something a bit like that not too long ago, but on a much smaller scale. Just one man forcing himself into humanity's consciousness, and even then he nearly won. Granted, he wasn't exactly your typical megalomaniac, but- an entire species?
You might have been right to make that trade after all. Sound like the sort that wouldn't have just given up on Earth, even if your Doctor had died.