Four-Armed People

The Four-Armed People (no official name) were the remnants of the citizens of Locus Prime.

Details
As the physical forms of individual minds within the D.O.M., the Four-Armed people were the closest thing to individual Locus Prime citizens remaining on the planet.

The Four-Armed People are hard light projections which can be encompassed by a physical form using a Bio-Printer. This is how abominations were created.

History
Every abomination that attacked the Earth was a Four-Armed Person in disguise as a monster or elemental. Prior to the hunt for the Mimic, the Four-Armed People only appeared physically after the death of each abomination, where they disappeared shortly afterward. The Mimic was able to continue living and moving after its physical form was destroyed, likely due to the experimental nature of the abomination, and was only killed by an energy pulse from the D.O.M.

Inside the Reconciliation facility, a Four-Armed Person attempted to take the form of Jane Newton, but its Bio-Printer was quickly disabled by Duck Newton and Aubrey Little. It proceeded to attempt to talk the Pine Guard into staying in place while the D.O.M. deliberated on an action to take, but was interrupted by Billy's consciousness, which somehow remained in the system, and clipped through the floor. It was not seen again afterward.

Several Four-Armed People emerge from the D.O.M. in order to defend it, and multiple enter Bio-Printers to attempt to form new abominations to take down the Pine Guard. They are quickly dispatched by the Pine Guard, though one of them takes a longer time than the others.

Nearly every single one of them was killed by Beacon after he was implanted into the D.O.M. by Duck.

Billy is the only known remaining Four-Armed Person alive, and currently operates the Reconciliation facility.

Trivia

 * The physical forms of Four-Armed People are described very similarly to those of Gems from the TV show Steven Universe.