From the very point where her morality blockers are removed, it's made clear that she's evil because she wants to be evil, and all of her traits-hubris, egomania, effective insanity-are all traits you find in human villains.

Ultimately, what's really scary about her isn't that she doesn't care about you-it's that she cares very deeply about you, or more specifically, how you can gratify her ego. 'Nice jump, human.' The security bots are just shock.The maintenance level with its almost completely invisible mutants, very dim lighting, and spooky music virtually defined video game terror for the younger version of this troper.

The compliment for your little burst of cargo-bay athletics is pure Paranoia Fuel.

SHODAN rooting your brain in the final cyberspace battle.

Almost at the outset of level one it seems that something has gone badly wrong on Citadel Station, but apart from murderous robots, half-human shamblers and lots of scorch marks everything seems relatively normal until you reach level two, which is littered with human corpses, and level three, in which you have to find a severed head in order to bypass a retinal screening lock.

From that point onwards it seems most unlikely that the game will have a happy ending.

System shock tv tropes