Jon knew just what to transform her into. There was never any doubt in his mind. Still, Karyn was useless to him in her current state, and she would need some serious modification before she could serve him adequately. He'd have to get to work out the specifics.
Her arms and legs would have to go for a start. Karyn's feeble limbs would never stand up to the punnishment her new role would put her through. Instead, he'd fashion her a set of artificial replacements. These would be constructed from a plasti-steel alloy, and would allow her more than a full range of motions, via an advanced system of hydraulics. They would also contain a complete sensory feedback system, so she would lose none of her sense of touch and would allow her to improve her reflex times dramatically.
These systems would have been linked to a neural-net processor implanted into her brain. In addition, this would enable him to download the skills she would need as a ninja, as well as allow him to suppress any of her emotions that he found 'undesirable'. In effect, he would be granted full control of her personality. The processor would also contain a diagnostic AI. It's duty would be to oversee her physical well being, and control the stream of medical nanobots released into her body.
Other changes that would have to be made included the reduction of her breasts for balance reasons, and the implantation of a visual sensor in her left eye socket. The old eye would have to be discarded. A set of plasti-steel body armour would need to be constructed to protect her head and torso, and just for ascetics, her long blond hair would be replaced with a shorter, darker cut. Jon never could stand blondes.
Jon looked over his plans. They seemed more than adequate for his needs. Now all that remained was for him to make his modifications.
"Time to summon Karyn" he thought.