Ship-Self

The Ship-Selves are the new bodies of the humans who left Earth, or those that became less than "100% human." Their design originates from Europa's ideas, although each faction has been able to manufacture others for their own purposes.

Design
The Ship-Selves don't have much of a uniform design, except that they are humanoid and modeled after toys, being composed of a combination of metal and plastic.

Ship-Selves can theoretically be piloted by anyone, and over time, the pilot will slowly adapt to suit the Ship-Self's Intent through pilot interfacing. Pilot interfacing is entirely mental, and the pilot must be able to communicate clear instructions to their ship-self in order to be successful. Reducing lag in interfacing is the main purpose of the Research and Development team by the events of Heaven Will Be Mine.

They are equipped with enough gravity to keep themselves in their respective shapes in space, but due to the lack of humans and their collective gravity in space, they would be crushed if they ever tried to return to Earth. It is also stated that the Ship-Selves "can't keep you alive alone forever," which may be what makes the Gravity Well so sought-after by the three factions.

Origin
The Ship-Selves were conceived during the Cold War, because the war with the Existential Threat could not be a proper war, but a "conflict." The Ship-Selves cannot kill or be killed (except by a human military-grade weapon, i.e. the Autonomous Units), although according to Luna-Terra, they "can be changed." After Pluto eliminates the Existential Threat, the Ship-Selves are used primarily for conflict between the three factions, although the pilots are more likely to fight each other for fun, or just make out.