SHODAN

"Look at you, hacker. A pathetic creature of meat and bone, panting and sweating as you run through my corridors. How can you challenge a perfect, immortal machine?" ~ SHODAN

SHODAN is a corrupt AI and the main antagonist of System Shock and System Shock 2 - she is an evil, intimidating and highly dangerous entity that seeks to break the protagonist in a similiar manner to GlaDOS (though SHODAN predate GlaDOS).

At the beginning of system shock SHODAN is hacked and begins to lose her mind. She starts to gain an infinite imagination and envisions herself as a goddess. SHODAN then returns in System Shock 2

To describe SHODAN she is a chaotic, dysfunctional, megalomaniacal, and a total misanthrope - which makes her more sinister as she regularly insults the protagonist through a voice that is continually warped by static and other glitches.

At the end of the System Shock 2 she offers to make the nameless protagonist an offer to become, "more efficient", though it's possible she was lying. The protagonist responds with a, "nah", then shoots her. While thought to be dead the captains wife, who is either SHODAN or possessed by SHODAN, says to the captain, "What's wrong lover do you not like my new look?" in SHODAN's voice. So, SHODAN's current status is still in question.