So... you are, in effect, the soul and mind of Rory Williams, as remembered by his fiance, placed into the shell of some sort of artificial human constructed to be a soldier and to be psychically controlled by this Nestene being. An undead, but with a body of 'plastic', not flesh.
[she totally doesn't seem bothered with the idea of you being undead -- it's not a slur, just a descriptive word to her]