Guardian 452, Bob is the main character for the first two seasons of Reboot. He has funny-looking metallic-colored hair, a frequent target of light-hearted ridicule for many Reboot fans, and a neat outfit. He carries Glitch, his trusty keytool, which can take the shape of nearly any object or tool. He defends the system of Mainframe from such foes as Megabyte, a virus who seeks to corrupt and conquer Mainframe, Hexadecimal, Megabyte's nigh-omnipotent sister who torments the citizens of Mainframe with her chaotic tomfoolery, and The User.