GLaDOS

Personality: GLaDOS' personality core defines her as being a clandestine, surreptitious, manipulative, and revenge-obsessed test master. She speaks in an extremely cold monotone and does not display any emotion, at least towards Chell, and remains incredibly calm throughout most of her appearances. Her only purpose in "life" was to force people to complete her tests and then get results. GLaDOS promises to free the captive if they complete all of her tests; however, this took an estimate of sixty years, she either didn't realize or care that the captive would be dead when they were completed. GLaDOS was an emotional sadist and a torturous psychological abuser, after imprisoning Chell in her tests she continues to mock her with cold, disturbing facts and dry cutting insults. GLaDOS continuously insults Chell over being an orphan and friendless and insinuates that she is fat. GLaDOS gives facts she describes as interesting, but uses to jab her captive, such as saying that Chell is breathing the same air the rest of her life or even just flatly saying, "I hate you." Although GLaDOS was only passionate and temperamental about completing her tests at first, as Chell began to defy her, GLaDOS's insane, deceiving, and narcissistic nature slowly began to develop, focusing all of her near-omnipotent control over the Aperture Science Enrichment Center to either torment or kill Chell. GLaDOS had a tendency to frequently lie about her current emotional state, and she would never admit when she was frustrated or angry. However, when she was overthrown by Chell and the power-crazed Wheatley, her personality began to divert. First, when Wheatley tried to give himself credit for deposing her, she immediately told him that he had done nothing to accomplish that (which was false, as Wheatley had, in fact, performed some behind-the-scenes sabotage to help Chell defeat her), and that Chell had done all the work (though in saying this, she unintentionally drove Wheatley into betraying Chell). After she had been turned into a potato, she developed ornithophobia, a crippling fear of birds, after nearly being eaten by one, and became a more compassionate, optimistic, and kinder person after discovering that her mind was created using Cave Johnson's (who was the CEO of Aperture Science) assistant, Caroline. GLaDOS (as PotatOS) was able to bury the hatchet, if not for a personal goal, and helped Chell defeat Wheatley so she could return her to her body and control Aperture Science once again, and in return, GLaDOS would free Chell. She even defended Chell to Wheatley when he, like GLaDOS before him, insulted Chell over being adopted. When Wheatley was defeated and GLaDOS was returned to her original body, she returned to her malevolent, cynical, evil self when she deleted Caroline's program from her mind. However, she did not kill Chell and fulfilled her deal by releasing her from the Aperture Science Enrichment Center, claiming that it is because Chell is simply too hard to kill, and coldly warns her not to come back.

Apperance: looks like a woman - with a head, a chest, a large abdomen and two arms - hanging upside down by her feet, an arm bound around her legs (an effect actually intended by the team). And she has a glowing orange dot as her eye and she hangs from the ceiling.

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