Robobrain

Robobrains or brain bots are multi-purpose robots whose memory and programs are stored inside an organic or partially organic brain contained in its dome shell atop the machine. Robobrains were created before the Great War by General Atomics International for the U.S. military. They are considered superior to most robots, as their human brains allows it a wider range of responses and functions than other robots. Their hands are suited to use most tools and weapons usable by humans.

Robobrains were going to be the next wave in warfare but their costs made it slow to implement. They use mostly human brains taken from "volunteers" pre-war. Most often these volunteers were criminally insane, so the robobrains aren’t the most stable group of 'bots ever assembled. Thanks to some pre-war technology, the brains are kept alive even 200 years after the Great War.

Sierra Army Depot Robobrain
The Brain Bot in Sierra Army Depot 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.

General Barnaky
After general Simon Barnaky was abducted by the Calculator's robots, his brain was put into a humanoid brain bot.

Appearances
Brain Bots appear in Fallout, Fallout 2, Fallout 3 and Fallout Tactics.