Where whims and dreams blend into reality...
Recently I just realised that I'd literally NEVER done coloured pictures of any mystery beings except the Insulator and the Eventuator. So I decided to fix that.
From top to bottom: Instigator, Nebuliser, Synergiser, Observers, Ostentator, Conductor, Postulator, and an attempt to make a default colour scheme for hexarts.
I had to make a diagram of the mystery beings' various sensors, because not even I could get them all straight. :P
As you'll notice, many of them can see in either infrared or ultraviolet, and the extra-special Instigator can see both. All of them also have a strange extra sense, which practically nobody in-universe knows the exact purpose or mechanics of (or at least, practically nobody outside the mysterious Borderlands; it's unknown how many people live inside them, if any). This sense is a little weaker in the Instigator than most, nearly absent in the Ostentator, a little better than most in the Conductor, and very strong in the Postulator, which seems to be able to use it in place of sight.
(I said Postulators don't usually echolocate before, but now that I think about it, I can actually see them using sound/radio waves in conjunction with this sense a lot, so that is probably no longer canon.)
Postulators are fluffy bat-like beings with great hand-like wings (or wing-like hands, maybe) that like to live in dark places, but have made it their task to assume that figurative light extends everywhere and to strongly argue that no matter what happens, things are not as bad as they appear. Though they have no eyes, the pads of their wing-hands appear to act as sensors that can somehow intuitively "feel" the world around them, allowing them to navigate without even using echolocation in a much wider radius than bats (though they do apparently have that ability too). Nobody really knows how this works.
Ostentators are showy quadrupedal beings that look somewhat like llamas with leijonœrn faces. Each one wears a large, showy fur coat over its back which it is very rarely seen without, even though logically it would not only not need one but could easily overheat wearing it; for some strange reason, these coats do not seem to cause them any problems. Oddly, the markings of these coats seem to vary randomly from individual to individual without any real connection to anything, even though all Ostentators' body markings are more or less identical.
Nobody really knows where Ostentator coats come from, either, since while they are separate from the being itself and young Ostentators seem to start out with full-sized coats that never change in size, nobody has ever seen an Ostentator without a coat first get one. Some have boldly suggested that the coats may simply materialise out of nothing the moment the Ostentator is born, or weirder yet, that the coats are somehow born first and then the being grows out of them like a sporophyte. But, again, nobody even knows what the most probable explanation is.