8 Video Game Enemies That Are Secretly Friends
5. GLaDOS - Portal 2
GLaDOS is the primary villain of the first Portal - the hilariously malevolent AI who can only scarcely conceal her desire to kill protagonist Chell.
Though GLaDOS is destroyed at the end of the first game, she returns in Portal 2 and, while initially still villainous, becomes a more sympathetic figure throughout the story.
For starters, GLaDOS is superseded by the even more maniacal AI villain Wheatley, forcing her to team up with Chell in order to defeat him.
We also learn considerably more about GLaDOS' past, namely that her personality is based on a human, Caroline, the implication being that any time GLaDOS is being compassionate or heroic, that's basically the Caroline persona peeking through.
Now to be fair, GLaDOS does end up deleting Caroline at the end of the game, but only after helping destroy Wheatley and saving Chell.
All in all, she still does the right thing and liberates Chell, surmising that trying to kill her is just way more effort.
That's a twisted form of progress, right?