I’m more than happy to lay out what’s known~
The Triglav race comprises three types of life: the Narodnya, which are human beings (or close to it), the Navka, which seem to be some manner of digitized infomorphic echo, a sort of soul of the dead, and the Koschoi - which we know nearly nothing about.
In the organization of Triglavian civilization, the Navka seem to be the lowest rung on the ladder; they are not considered sapient life in the same was as the others are, according to some information in the Datastreams, but are Triglavian nonetheless. The Navka Overminds are in fact actual Navka in communion with the Drones - that is to say, they seem to be using these drones as bodies.
The Narodnya are the middle element of society, seemingly by far the most numerous - but above them, the Koschoi seem to take some sort of elder role, the highest rung.
All three of these elements come together in “Troika” - an assembly of three minds in one body - which comprise the majority of Triglav anyone fighting them would encounter. Each Triglavian vessel has a “Tactical (Or logistical, strategic, depending on role) Troika Designation” - this number indicating the number of individuals onboard, though if you crack open the hull you’ll find exactly one-third that number of bodies.
Zorya Triglav is a Troika as well. Their female voice is that of the Narodnya, the body. Their robotic voice is most certainly their Navka’s, and the authoritative male voice is undoubtedly their Koschoi.
If the Navka are such a step below the Narodnya, then what in fact are the Koschoi? The only clues we have seem to suggest a perhaps more elevated state of being. Some suppose that they may be a form of free infomorph, etched onto the fabric of spacetime itself and capable of being anywhere - which, given the suggested nature of their communications and data storage, is entirely plausible:
TRIGLAVIAN HOLOGRAPHIC TRANSCRIBER
This device was recovered from the wreck of a Triglavian Collective invasion vessel and, although the means by which it operates is not fully understood, it appears designed to “transcribe” large amounts of data into spatiotemporal storage using the holographic principle. The startling possibility raised by this device is that the Triglavian Collective stores much of its information in the fabric of spacetime itself and quite possibly in dedicated singularities. This device has a large integrated data buffer.
In comparison, the very physically tied Navka are as much a step below Narodnya as this hypothetical form of the Koschoi is a step above.