Gary (clone)

Gary was an inhabitant of Vault 108 and clones of him are the only people left in the Vault

Background
Part of a grand cloning experiment with a fatal end, 54 clones of "Gary" were created. Each had varying levels of violent and psychotic traits and behaviors, leading to the scientists' deaths and Garys running freely throughout the Vault. They use inflections of voice tone, speaking only their name, to communicate and are hostile towards any outsiders.

A holotape labeled cloning log can be found in the Vault 108 cloning lab, which explains that Gary was cloned at least 54 times. All clones exhibited hostility towards non-clones, with each successive clone being more and more violent. When the Vault scientists started running out of room to store the clones, they planned to destroy some of them to make room for additional test subjects. Sometime afterward, the clones violently took control of the Vault. One can find their location, Vault 108, with the Vault door ajar.

Appearances
Gary clones appear in Fallout 3.

Behind the scenes
The Gary clones are referenced in Fallout 4 as a running gag, where four wooden blocks can be found in assorted locations spelling out "GARY." Another collection of "GARY" blocks are found in the Whitespring Resort in Fallout 76.