Is there any canon reference to the Mirror Universe Borg that would explain more about them?
I've tried searching on my own and haven't found anything.
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Within the main Trek Series and films, there's zero indication of a Mirror Universe Borg society. It probably exists, but we simply don't get to see it.
Deep in the bowels of his mechanical hive, shielded by overlapping layers of multigenerative security grids, the Borg king detected a disturbance spreading through the Collective, interfering with the proper operation of the ship. Ego buffers protected the king from the alien pathogen, which was rapidly overcoming the various measures installed to protect the ship’s systems from contamination. The king noted that the mysterious pathogen had already infected the vinculum linking the vessel’s various drones and unimatrixes. Interesting, he mused.
They travel around in massive 10Km wide cubes.
Mirror Universe Borg are even worse than their Federation Universe counterparts. They possess the same hive mind, the same techniques of assimilation, the same superior technology — but the resemblance ends there. Where the Federation Borg are zombie-like automatons, Mirror Borg are more proactively aggressive. Any time they sense an intruder aboard one of their ships, they attack with every resource at their command — they won’t ignore an unknown invader just because he’s “not interfering” with them.
They’re also much quicker than Federation Borg. Thanks to developments in Borg nanoprobes and other technologies, Mirror Borg lack the stiff-legged gait and awkward motion of Federation Borg. With their skeleton and musculature enhanced by Borg technology, they move very quickly. Drawing a bead on them with a disruptor, or avoiding their hand-to-hand attacks, often becomes an impossible exercise. Their cubes are larger, as well — 10 kilometers on a side, or more — and equipped with incredibly powerful weapons capable of destroying a Vor’cha-class ship with a single blast.
Aside from that, their society is pretty similar to Main Universe Borg.