The traffic in Minga slaves is illegal in many jurisdictions in the Strange Stars, but the owning a being of such a famous genotype--fragile, delicate and ephemeral as biosophonts generally are--is too much a status symbol for the wealthy in the Vokun Empire and other polities to ignore. What the Slavers who trade in them and the collectors who acquire them don't realize is that their slow dissemination across the galaxy and their meek servitude in places of wealth and power is all part of their plan.
Appearance and Biology: Minga resemble the baseline human type, and are considered physically attractive by most of that clade. They are gracile of build and have pale skins, ranging from a pink-tinged porcelain to chalk white. Their hair and eyes are in a wide variety of pastel shades. They tend to have large, expressive eyes.
Psychology: For autonomous sophonts, Minga are very submissive and complaint beings. They do disagree from time to time, but always do so in an indirect way best calculated not to give offense. They are nonviolent, even against personal attack, but will defend themselves if absolutely necessary. They are incredibly intuitive beings who seem to anticipate (and then serve) the desires of those they spend any significant amount of time with. Most who try to read a Minga's expression will find exactly what they wish for; only the particularly empathetically adept will note that the Minga are in fact exceedingly hard to read and generally just reflect the wants and desires of others.
The Minga are exceptionally skilled at reading the microexpressions and kinesics of other humanoids. It may be this ability is enhanced by some level of psi empathy. In contrast, they have a fine degree of control of their own nonverbals. They are skilled at manipulation, both through voice, body language, and physical intimacy. This ability is likely pheromonally and psychically enhanced.
Slavery & A Secret: Minga emerged from a world in the Coreward Reach. It's exact location is known only to the Slavers and their thralls. The Minga were immune to Slaver psionic control, but their allure to other humanoids was apparent, and so they were spared from destruction. Slaver's take away shipments of Minga youth (never too many, so as not to saturate the market). Though the Minga are relatively long-lived, the Slavers have certainly not bothered to introduce any of the anagathic therapies common to civilized worlds. The Minga elders seem to rule their society but meekly acquiesce to demands of the Slavers for more of their people.
The Minga don't enjoy subjugation or their world's occupation by the Slavers, but their ruling cultural belief is in nonviolence and the spiritual exploration of sensuality. The Slavers and their thralls opened the Minga's eyes to the deplorable and iniquitous state of the wider galaxy. It was decided they would use the Slavers as a conduit in their mission to convert all sophonts to their way. The Minga are patient; slowly each slave is bending their supposed master to their view of enlightenment.