Spoken like a true executor of the church. Even that troublesome priest Kotomine would find it difficult to fault your commitments.

[ She puts on a great show of yawning, making the effort to look bored. Irisviel remembers dying to Kirei, she remembers the other failed homunculi and she remembers being swallowed by the black ichor of something. All she could tell was it was evil, All The World Evil. And though her personality has been preserved since coming here, there is some part of her that is still touched by that.

And occasionally manifests when given the opportunity, such as when her team spectacularly failed that mission. ]

Irisviel von Einzbern, Vessel to the Holy Grail. Nothing you don't already know, it seems.