An artificial human.
A wonder of molecular bioengineering, its biological composition comes in various forms based on need, from carbon based duplicates of real humans to those based on silicon or liquid metal. many of the Realians onboard the Woglinde were made by Vector, and they are hybrid models with a carbon/silicon base.
Since the Miltian Conflict, the alteration of a Realian's emotions is no longer allowed. The only exceptions are for Realians in the military or other dangerous occupations, such as terraforming.
Their basic rights equal those of humans and are recognized by law. However due to the fact that their minds are initialized with a slight bias, all realians tend to display similar personality traits. This bias is applied not only for the purpose of preventing criminal behavior by realians, but also in consideration of humans who may feel threatened by their "superiority"(albeit only in certain specialized skills).
Several companies manufacture realians, but Vector makes the basic program (in other words the central nervous system) of all Realians.
The program is essentially a black box, and any modification beyond regular maintenance and adjustments can only be performed by Vector.