Neptunian

"For the longest time, the moons of Sol VIII was home to the 'ice pirates,' a loosely affiliated band of anarchists that raided the inner system for goods and material. They were famous for their use of pykrete, a surprisingly tough material made from powdered plant material and water. In particular, their pykrete knives, which they sharpened with lasers, were feared tools of assassination and murder. It's a good indication of what a population of humans can get up to in desperate conditions with no supervision."   ~Quazhe, Kheezer Humanologist.  

Ice Pirates

The Neptunians have a long, storied tradition of piracy. They are adapted to the cold of their home moons, and are uncomfortably warm in temperatures that have most people reaching for a light jacket. Their culture and home environs promote a sort of collective nihilism. They gain psychological strength in numbers and they care little about themselves while simultaneously being selfish and individualist in nature. This means that while the last pirate of a Neptunian crew may break and run, if there are two of them either would die for the other, with men being an order of magnitude more expendable than women. This applies even if they don't particularly like each other. This quirk made the Ice Pirates able to punch well above their weight in their heyday. It's also responsible for their use or, as some may say, overuse of Neptune Blue and Combat Stims which wreck their bodies and shorten their lifespans but give them an edge in battle.  

Chemheads

Neptunians are the inventors and primary users of Neptune Blue. While they don't have an immunity to developing Blueteeth, they do have a much higher tolerance for it than others. Additionally, their bodies are able to process lesser Combat Stims and even caffeine more efficiently and with lessened side effects. All positive effects of stimulants last twice as long, a Neptunian's limit before OD is doubled, and a Neptunian can go twice as long before *needing* another hit.