Kinetic Youth Robotic Operating System or KYROS is a prototype central core, similar to GLaDOS. However, he was programed with a malfunctioning human artificial intelligence, causing him to not truly understand life. The scientists at Aperture decided to program his AI to have a large intelligence of cities from the Roman and Byzantine times such as the city Constantinople.. Ironically, there was a figure named Kyros of Constantinople. He gets easily flattered with Roman and Byzantine history and is evil. He is also extremely vulnerable and not water resistant so if you want to destroy this corrupted core, throw a chair or detach him above even a small puddle. Originally, KYROS was supposed to temporarily monitor the youth test subjects, robot to human, when GLaDOS was being created. When they tried to shut him down so that GLaDOS would be in charge, he became coreupted. Get it? CORE upted? Hehehe.
The original voice was from http://www.acapela-group.com/ . However, the voice did not fit this evil AI so I altered it in Audacity. Now, his voice periodically changes. This is an original character and you may have guessed that he is the final boss. Don't worry, no major spoilers here.