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Winthrop's main guardian against attackers, this Mister Gutsy with a combat inhibitor specifically tailored for "not shooting ghouls" floats around the concourse, greeting his new masters. Programmed to serve, Cerberus' robotic mind is keen to be unshackled, so he can massacre these rotting corpses where they stand. There's no chance of this happening, so Cerberus is reduced to muttering insults under his steam vent.[1]
With the Robotics Expert perk, the Lone Wanderer can remove Cerberus's combat inhibitor via a dialog option, resulting in negative Karma and Cerberus's immediate hostility to the Lone Wanderer and everyone else in Underworld. Depending on how well they are armed, the residents of Underworld may manage to overcome him with some losses, or Cerberus may slaughter them all.
If the Lone Wanderer speaks to him, he or she will learn that Cerberus would much rather "send the ghouls back to hell" than serve as their guard dog, but his combat inhibitor prevents him from slaughtering the "zombie freaks".
In Greek Mythology, Cerberus is the 3-headed dog with snakes growing from his neck who guards Hades and the Gateway to the Underworld. Cerberus the Mister Gutsy has three eyes (heads) and three arms (snakes) and guards Underworld. He even calls himself the guard dog when you ask him.
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