Crewmate

An unnamed species of diminutive alien humanoids, identified as Crewmates to distinguish them from the monstrous Impostors plaguing their space program. This space program is the only observed aspect of Crewmate society.

Biology
While little has been observed about these creatures, they are clearly distinct from Humans.

It's also known that they are skilled with technology and can manipulate it to cause madness.

They also are shown to breathe oxygen or O2

Apparently, they also have hidden floating hands, possibly inside their bodies which they put out to perform tasks.

Culture and society
This species prefers to communicate by written language, and might not have a spoken one. They are also known for killing their own members with no apparent remorse.

The majority of their technology is identical in appearance and sophistication to its human counterparts. Crewmates possesses all the necessities of easy interstellar travel, and their teleportation technology can move living beings into a moving spacecraft. They also have the technology to stabilize seismically active surfaces. They also have computers so advanced that with a simple touch you can change them, and send you things like clothes, objects, animals, among others all by computer.

The purely scientific aim of the Crewmate's space program makes it unprepared for the gruesome events that plague it. It follows an anarchic form of labor organization, where all members are given an equal amount of labor by their electronic systems without hierarchy.

Appearances

 * Among Us                                                                                      
 * Henry Stickmin: Completing The Mission