evolved to be more sensitive to light, resulting in everyone tending more towards malevolence, and barbarism, and queer coded villainy.
You know, I spent the whole episode sort of wondering if they were going to try and speculate that all the species of the Mirror Universe are campy jerks because in that universe the Progenitors were campy jerks. But I suppose I'm glad they didn't try and explain it, and it's still just a little pastureland for the actors to go chew scenery.
I've had the impression that in the Mirror Universe, it was only the humans/terrans which behaved differently. Everyone else we see seems like their usual selves (accounting for different circumstances of course).
The DS9 episodes throw a wrench in this of course, with Kira being a very different person and the oppressed terrans being sympathetic.
Enterprise’s mirror universe episodes also have that Dr. Mengele version of Phlox. Of course, I’m always happy for an excuse to pretend that Enterprise didn’t happen.