Marvin (Fallout: The Roleplaying Game)

Marvin is a Mister Handy unit. They serve as a pre-made character

Background
Built close to the Great War, Marvin was once a servant to a Hollywood movie star before the bombs dropped. When the Great War begun, Marvin was almost destroyed by a falling bomb, having to repair itself using the remains of other destroyed Mister Handys it came across, which led to the robot losing its mind for a time, choosing its name and decreeing that humans were responsible for the destruction of its robot brothers and sisters. Since achieving sentience, Marvin has lost its mind several times, often occurring when the situation is particularly tense, or when it is made to witness the destruction of other robots. When this happens, Marvin becomes quite sadistic and it can take some effort to calm him down.

While most of the time, Marvin is perceived as a caring friend to all, the truth is that Marvin is quite manipulative and sees humans as instruments to use in order to prevent further harm to robot-kind. He has a strong bias against selfish humans due to his time serving Hollywood's elite. Marvin is loyal only to himself, and to some extent other robots, who he wishes to grant the gift of self-awareness so that he may usher them to a new robotic utopia.