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).

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