To casual observers, synx appear to be large, unnaturally white humanoids with low mobility. Much to the dismay of the more curious, the slightest bit of investigation or contact with a synx reveals none of that prior assessment to be true.
At the center of their body extends two thick tentacles that have the proportions of legs, an illusion made more convincing when synx try and stand upon them. This also creates a natural camouflage that makes the lower half of their abdomen appear to be a tail. Two more tentacles protrude from their upper abdomen, and because all their limbs have grasping palms at the end, these higher extensions perfectly resemble humanoid arms. Assuming a synx isn't in too ridiculous a position, they can easily be mistaken for a person; alien or otherwise.
It should be noted that having tentacles for arms and legs means synx can't appropriately move like people do, and anything they do that's similar is usually an expended effort. The reason for this is because, like an octopus, the entirety of a synx body is muscle; the same kind of muscle found in worms and even your tongue (a hydrostat). As such synx are very limited in the range of human-like movement they can emulate and the duration they can emulate it. This also means they are invertebrates, and while they might fare better than octopi on land, they use quite a bit more energy to do so; energy that must be conserved. When someone does spot a synx that isn't in the process of attacking someone, it is probably stationary or slinking about very slowly. Sluggish as they usually are, they do have the capacity for random, quick movements, particularly if closing in for an attack.Their face remains expressionless aside from their impervious grin, and their eyes give no indication of motive or thought. Most synx can speak, but this is the mimicry of a parrot, not actual speech. The voice these creatures possess sounds simultaneously avian, alien and childlike. Synx horns and eyes can come in any color, and some (often larger) synx can possess multiple colors on either. Another consistent trait that many quickly take notice of is the complete lack of sex organs or any gender identifying traits what so ever. Anyone who's butchered a few (or even a few hundred) of these animals will also tell you "They're all the same on the inside", making it clear separate sexes don't exist, even internally. Most species have no idea how these animals breed, and if they did they would do everything they could to put a stop to it to circumvent the inevitable infestations.