Nathaniel's upgrades are as follows.

Upgrade Synaptic Parasite
Add Charming Aura (this is cumulative with the diplomacy bonus of Too Innocent To Kill, right?)
Custom mutation - [b]Divine Flesh:[/b] Nathaniel's body, having experienced its first real life or death combat with a gun, has adapted to improve his odds of survival. The muscles and nerves throughout his body have changed and become better than they were mere days ago, and even his brain has gotten a bit of a boost. Nathaniel's reaction time has improved greatly over that of the average human, to the point that he can start moving out of the way of an attack at almost the same instant as his opponent starts to move, and when he decides to attack without warning he is quick enough to almost always get the drop on his opponent. In addition, his hand eye coordination has improved and his hand and arms are far steadier than they used to be when holding a gun, which is a great boon to his accuracy in firing. (Bonus to reflexes and gun accuracy) (Mutation effect: The veins in Nathaniel's hands and arms now stand out very clearly and vividly through his skin, and they appear red instead of blue.)