Thank you for participating in that Aperture Science Enrichment activity. Rest assured, that there is absolutely no chance of a dangerous equipment malfunction prior to your victory candescence. McLain made the GLaDOS character enjoyable by singing songs, which were then synthesized in a robotic voice during the end credits. GLaDOS went through various design changes. She became one of the greatest video game villains of all time, especially in the '00s.
The gamers found her witty, narcissistic, passive-aggressive, and fun. It is later that the players realize her true intentions when she becomes more malicious. Initially, it was made to guide the players during the game and aid the Enrichment Centre.