Char history further

He doesn't remember his friends nor family, their eventual deaths in the great Toxian disaster.
The intervention (a fusion of his body \ mind with a computer system based on DNA-molecules) was in part, an experiment which created Morbus Gravis. Performed by an unknown group of extremely powerful people which had ties to his family, damaged bits were replaced with mechanic parts. He is 44% human (mass \ volume) but how human he actually acts, you will have to see for yourself.
Literally forced by some inner drive to seek knowledge with a hunger - to infinity, it would appear. Whatever nutrients he can collect are filtered to supply his body with a perfect nutrient mixture. If he collects enough, it would stop him from aging, though he isn't aware of this.