I personally have no problem with the Doctor being half-human. Hell, I make a direct mention of his human mother in "The Spindle of Necessity."![]()
You do? Whoa, I thought that was something DW authors generally avoided like the plague.
Does the Eighth Doctor actually say the Master was the enemy he wanted to fool in The Forgotten? Maybe the Seventh tried to become human to prevent something nasty happening to him due to his Gallifreyan origin, but only partially succeeded (The narrative does say that the Chameleon Arch he used was damaged) and when it was over he decided to stick with being half-human a little while longer to see what it was like?