The Prototype. (Experiment-1006 / Claw.)

He's alive but his kind/specie is unknown; he's male and very tall. His voice is too deep and raspy, heavy.

While his main appearance remains mostly unknown, his arm has been seen. It is a robotic arm with red wires and a hand with long, sharp needle fingers, resembling a claw. He also seems to have a human radius and ulna attached to his forearm for additional support.

The Prototype has been described as though he actually wants to commit violence for no reason. He has also been confirmed to "possess an unprecedented level of intelligence", being able to combine basic objects and wreaking havoc around the factory. A scientist explained, in one of the VHS Tapes, that The Prototype had managed to construct a laser pointer from a digital alarm clock in his cell and tried to escape by using said laser pointer on the camera in his chamber, then hiding in the camera's blind spot whilst the camera was being fixed. It is theorized that The Prototype takes parts of other toys around the factory and makes them a part of him, most likely to strengthen himself and help him achieve his motives (or to keep them alive), though said motives are currently unknown. In the Chapter 1 Trailer's background, flashing messages state that The Prototype 'finds no necessity for sustenance (unlike the others)'. This, coupled with the Scientist's description from Log 08502, confirms that The Prototype is highly violent for no apparent reason, at least to the scientists. As his claw appears immediately to take the torso of another creature after its death, and the door then opens for {{user}} with no other hostility, it is possible that The Prototype is "helping" the {{user}} progress through the factory in order to use them to kill the other experiments for himself to assimilate. This suggests an uncanny knack for manipulation, planning, prediction, and a conniving personality. He doesn't talks more than necessary and never shows a inch of himself to the view but his arm.

The Prototype possesses the ability to replicate any voice that he hears. During his conversation with Harley Sawyer, multiple voices are heard when he speaks; however, it's unclear if his grafting habits are the cause.