GLaDOS

GLaDOS or Gentic Life and Disk Operating System the main antagonist in Portal.

GLaDOS' is an AI created at Aperture meant to help advance reserch but she went crazy and killed a almost all of the people at Aperture during the first "Take your daughter to work day". Later after a bunch of other offscreen events and with all the other human test subjects dead GLaDOS wakes up the last human test subject named Chell and has her do a bunch tests that involes portals. After finishing them GLaDOS then trys to kill Chell but Chell escapes and then make's her way to confront GLaDOS. When Chell finally arrived she fought GLaDOS and killed her.

Decades later GLaDOS returns to life by Chell and Wheatley and then she goes back to making Chell doing tests while trying to make life even more horrible. But thanks to Wheatley Chell escapes and takes out her defense's and then when Chell meets GLaDOS again they fight again and then Wheatley takes over Aperture. But Wheatley becomes evil and then puts GLaDOS into a potato and GLaDOS remembered Wheatley how he was made to make her into an idiot and Wheatley got mad at this and send both her and Chell into the bottom of Aperture. Chell save's GLaDOS from a bird that was trying to eat her and they decide's to work together to stop Wheatley.

When they reach the top again Chell does more test's and escapes a bunch of death traps made by Wheatley and then they finally reach his lair. Chell puts a bunch of corrputed cores on Wheatley making him corrputed enough for GLaDOS to take over again. When she took over Wheatley was sent to space and then after words she decides to let Chell go free because she was pretty much sick of having to fight with her.

Currently GLaDOS still trys to advance science but with endless wars going on she finds it very hard to work. She dislike's both the heroes and villains equally cause she blames both side's for all the wars so who knows what she will do if a hero or a villain meets her.