GLaDOS

"'This was a triumph.'"GLaDOS is a user who joined during User Battles: Recharged. She's the main antagonist of the Portal series, and a member of the Arena's Security Team.

History
GLaDOS is a supercomputer built by Aperture Science. Cave Johnson, the company's CEO, was planning to transfer his own consciousness into the AI's body to cheat death, but sadly, he died before that was possible. His last wish was to leave his assistant, Caroline, in charge of the facility, so instead, Caroline's consciousness was transferred into the AI. It was a success, but... not for long.

Soon after her creation, GLaDOS suddenly murdered everyone in the facility, and those who survived stayed there as her test subjects. Her first test subject, a young woman named Chell, was doing pretty well, until she suddenly escaped from the final test, which was supposed to kill her, and managed to destroy GLaDOS by burning her four personality cores: Morality, Curiousity, Intelligence and Anger.

Many years later, possibly over 50, GLaDOS had been rebuilt, and was now "alive" again. Chell, who was also back in the Aperture Science Enrichment Center, began looking for the AI, planning to get rid of her for good. She was helped by a core named Wheatley, who successfully took over GLaDOS' body, but then betrayed Chell, due to being corrupted by GLaDOS' programming. Chell and GLaDOS, who was now in a potato, made their way to Wheatley's "lair", and by shooting a portal at the moon, they sent him to space, allowing GLaDOS to save the facility. She also let Chell leave and be free.

And after that, it happened. GLaDOS was split up into two versions of herself, one of which got sent to User Battles, while the other one stayed in the Portal universe.

Room
Her room is basically her Portal 2 chamber. She can't leave the room, so she just watches people through the cameras and speaks through the intercom. Nobody actually knows, but some people think that the room may be much, much, bigger; maybe it's the entire Enrichment Center, who knows?

Battle Information
[Title:] GLaDOS, Genetic Lifeform and Disk Operating System

[Replica:] HandUnit

[Power Chip:] Personality Cores - HandUnit's personality and stats will change at random.

[Overcharge:] Aperture Madness - Aperture Madness - Portals open all around the arena, launching the opponent around randomly, before a mechanical claw grabs them and throws them into an incinerator, dealing damage and inflicting burn.

Trivia

 * GLaDOS has lost all of her battles, and currently has a record of 0-3. She has only won one battle, which was the Chica's Magic Rainbow rematch, but since it was a Special Battle, it didn't count as a win on her record.
 * Usually, nobody visits her, but she doesn't care. She prefers being alone rather than being surrounded by random people.
 * She once asked ZedRec, the Arena's security AI, over 15 questions, to test his intelligence. She also considers Zed her rival.
 * GLaDOS is part of the security team, and can do many things thanks to that job, such as closing blast doors, turning lights on and off, controlling other electronics, etc. Though, Henry has said that she's pretty close to getting fired due to some things she has done in the past.