i'd love love love to dig into the parallels karras and garrett share with one another because the game sets them up as foils and it's really good and well considered. both break from their initial order to do their own thing (the keepers, the hammers), both are self-obsessed, both are mired completely in their own pride. but where garrett has, and develops, begrudging connections to other people and a sense of duty at least a little beyond 'i want more money' and 'i need to pay rent', karras turns completely inward to the total exclusion of everything, even the god of the religion he is spearheading.
karras gets a lot of flak at soulforge for ranting down a mic at length for minutes at a time, talking about himself, but consider that almost all the dialogue in thief 1/2 is garrett talking to himself about himself, for his own self-interest. in soulforge garrett will quip something now and then in response to a rant, but these men can't hear one another, this isn't a conversation. man there's so, so much there, especially karras' fascination bordering on obsession with garrett. it's easy to take it as dastardly villain fixated on the only person who can stop him, which in part it is, but an angle i think is interesting is that karras' self-absorption is so all encompassing that he recognises himself in garrett and fixates on him as a result. when karras is about to wipe out all life to fill the world with mechanical simulacra of himself, speaking in his own voice, with his own face, the only thing that ends up stopping him is that a petty, selfish man walks back a petty, selfish choice for the sake of someone else