((I have an idea about Nyars box. From my own intuition and various facts, I have guessed that red is conventional, blue is medical, purple is unconventional, green is auxillary, and gold is exotic.
((Hm. Normally I'd say this makes perfect sense, but Mesk's Ultraregen was Purple. Wouldn't repairbots be Medical, not Unconventional? I guess they're not meant to be used in the field, so you could make a case for something else, but even then Uncon seems like an odd choice. Maybe because it's not wearable/doesn't require any real technical knowhow, but isn't point-and-click enough to be a gun nor bizarre enough to be Exotic?
Hm...))
((Aaactually, I looked at the armory list, and noticed that the various therapies, synthflesh stuff, and implants, which Mesk's repairbots could be said to be related to, are all in Exotic. If we go by that, and the colors correspond to the list, then that would leave gold for unconventional? Humm. That has melee weapons, explosives, and field manipulators...))
((True... and the cube, at least, might fit under Uncon if it's activated using the buttons rather than something completely bizarre like amps or Timmy powers. Timmy's ball though... I have a hard time believing Timmy's ball could be considered anything but Exotic, given that, as far as we could tell, it enhanced the user to be psychic. And, you know, infested them with a horror from beyond the stars.
Though just for clarity, based on the list:
Conventional is exclusively guns, or at PW described it, tube-death devices. If red is Conventional, it's hard to believe we'd get anything out of it but a vaguely tube-shaped object that you point one end towards something and then it dies or is somehow inconvenienced.
Unconventional is sort of a catchall category for death or inconvenience dispensing devices that aren't tube-shaped or psychic. Magic calculators, melee weapons, and explosives all fall under Uncon, so it might be safe to say we could get anything that doesn't fit better in Conventional or Exotic.
Exotic is amps and, as you say, all sorts of therapies and synthetics. It also, from experience, covers most alien artifacts, so the riding theme appears to be "weird," I guess? In any case, it seems likely that if you want weird shit, this is the category for you. If you want psychic powers, shiny new limbs, or death rays made by aliens who weren't familiar with the supremacy of the tube, this could also be your category.
Auxiliary is basically anything you wear, ride in, or pilot, as well as tools and robots. This might reinforce the notion that Green is Aux, since Aux really does mean "wearables" to some extent. So, if you're looking for shiny new duds, an alien go-kart, a new robot companion, or a fancy welding torch, Aux might have what you need.
Medical is anything that helps you help wounded people not die or be more comfortable, as well as, to some extent, mechanical equivalents in the medkits. Strictly speaking, the permanent painkiller breaks this trend, since it's a permanent treatment, not something you apply in the field as a response to something, but the spirit is very much there. If you want to help people, possibly including yourself, be less dead or inconvenienced via injury (or possibly disease, if the panacea can be judged on its name), Medical might possibly have something relevant to that.
So with that all in mind, both Golds match Exotic in terms of being Fucking Weird, but we don't know enough about the cube to say exactly what it does or how it works.
All three Greens match Aux in terms of being something you wear, though the goggles' functions might go beyond that and we have almost no idea how the shapeshifting armor works.
Two of our three Blues seem "medically" related (ie being drugs), with the third being completely unknown. It might or might not be worth noting that all three could potentially be limited-use, however.
One Purple is a bunch of genelocked internal robots that repair injuries, the other is completely unknown.
In short, Green seems to match, Blue seems to match, Gold seems to match, Purple seems like it might buck the trend and Red is completely unknown. Swapping Purple and Gold could make Purple match but Gold seem like it might not.))