Saver is an, interesting existence. Basically a Demi-Servant Servant, Saver is an autonomous force of good, mildly influenced by the human host. While a holy zealot, Saver is oddly understanding of mild moral and legal infractions, believing that as long as they repent, things will be forgiven.
He also has another side to him, he has an obsession with k owledge, and enjoys the company of intelligent people. He is imposed with quite a large amount of knowledge already, he continues reading on all subjects.
As a Servant, he is not at all concerned with the actions of his Master or the Holy Grail War, and only wishes to impose the will of Ahura Mazda.