GLaCAC

GLaDOS was a weak Malfunction, i intend to fix her mistake -GLaCAC after greeting the character in Portal 3

GLaCAC [Genetic Lifeform and Central A.i Core] is the main antagonist of Portal 3. GLaCAC calls himself the 'New and improved GLaDOS' He makes JaCOB, the main character in Portal 3, Undergo a series of much more difficult tasks than when GLaDOS was in charge. GLaCAC is much more aggressive than GLaDOS. At the end of Portal 3, he sings a song, much like how GLaDOS Sang 'Still Alive' and 'Want You Gone' we see a different kind of song in Aperture (Song)

Story GLaCAC was constructed when Aperture was found again 30 years after the events of Portal 2. Scientists began inhabiting the Facility and Aperture was back in production. GLaCAC learned that he was merely being used by the Humans and he called himself 'The superior being to these meat sacks' And destroyed them all so they may 'learn' He began getting bored by being the only thing left in the clean facility. Much like GLaDOS's Atlas and P-Body, he created JaCOB, a robot he may test on to destroy his boredness.

Trivia

At the end of Portal 3 It is revealed that GLaCAC was once Cave Johnson, the CEO Of Aperture

One of GLaCAC's Lines are 'When you kill me i will still be alive' A reference to GLaDOS's Song from the first portal, "Still Alive"