Robobrain

Brain bots in general are robots whose computer systems are aided or controlled by an organic or partially organic brain. The Brain Bot in Fallout 2 is a partially complete one of these, who can be completed by the Chosen One with one of four different brains depending on his/her science skill (from worst to best): the abnormal brain, chimpanzee brain, human brain (90%), and cybernetic brain (121%).

The brains have varying levels of competence. The abnormal brain is the worst, unable to obey any commands. The chimpanzee brain can leave and rejoin the party on your command, like other NPCs (except Miria and Davin). The human brain gives the Brain Bot mediocre gunfighting skills. If you implant the cybernetic brain in the brain bot, the AI Skynet downloads itself onto this brain. This is the only version of Brain Bot which can level up, and is a skilled rifle and SMG fighter, with full self-repair algorithms.