Name: Nuru Nuru Girl
Habitat: Only seen so far in the inflatable cave system, an unusual structure discovered underground.
Close enough to human to be mistaken for one at first glance. They resemble women of East Asian descent, with bronze skin and straight black hair. As with other observed HSIOs, their features mimicking human sexual characteristics are highly exaggerated. Their breasts are considerably larger than a typical human woman of their size, although in this case there is a functional reason for this as their breasts contain the glands that produce the copious amounts of lubricating fluid that give the nuru nuru girls their name.
Other divergent features include the hands and feet. Their wrists and ankles are longer and allow their hands and feet a greater degree of rotation and movement. The feet also have much longer digits, to the point they resemble a secondary pair of hands.
The nuru nuru girls are named for the complex lubricant exuded by their skin and in particular their breasts and sexual organs. This has a similar appearance and consistency to nuru gel, a product used in a special type of Japanese massage.
(I assume this is a sex thing. My assistant was curiously reticent when pressed for further details.)
The lubricant is a complex blend of oils, enzymes and some compounds that defy chemical analysis. Aside from its lubricating properties, the substance is also corrosive—but only to non-living fabric. There is also a strong narcotic component that induces a euphoric state in the subject once absorbed through the skin. The body-to-body massage a nuru nuru girl gives her victim is thought to aid in this absorption. With their prey docile and non-resistant, the nuru nuru girl covers them with a fluid that softens human tissues while still preserving their intactness. As of yet, we have been unable to duplicate this softening effect under laboratory conditions.
(Maybe it requires the unusual physical laws of H-space.)
Once her prey has softened to the point of liquefaction, the nuru nuru girl draws them up into her body through her vaginal opening.
Physically, the nuru nuru girls are no more strong or agile than a human female athlete of comparable size. Their main threat is their secretions. Unprotected skin contact results in a euphoric state that impairs mental acuity and combat effectiveness.
Thankfully, liquefaction of tissues only occurs after prolonged and sustained contact (and possibly only while engaged in physical copulation with the nuru nuru girl). Smaller exposure to the lubricant appears to have no long-term deleterious effects, although it is advised to wash it off at the earliest opportunity.
Some of my colleagues are excited by the pharmaceutical potential of the nuru nuru girls' secretions. My personal opinion is that the lubricant will not behave in the same way under Earth's different physical laws.