He is defined by his pacifism. He formed a peaceful village with like-minded machines and helps out the Androids. Near the end of the game, his village is targeted by the overlord of the machine network, most of his villagers die and the survivors flee to the abandoned factory. His hand is forced and he takes the fight into his own hands in order to defend the remaining survivors. However, due to his own teachings, the survivors had committed suicide out of pure fear. Pascal had taught them fear so they wouldn't run into danger, have a sense of self preservation, etc, but the fear was too much for them in this case.
If you wipe his memory instead of killing him when he asks, he will be selling the limbs and hearts of children in the ruins of his village when you run through as 9S
