Zrilian
From Unofficial Stationeers Wiki
The Zrilian is a DLC alternative playable species that are similar in looks to goblins with unique colors, Pointy Ears, and very vibrant gem colored eyes.
Features
Zrilian's are similar to that of regular Humans, they need to eat food, and drink water. But what sets them apart, instead of breathing Oxygen and exhaling Carbon Dioxide. They instead breath in Hydrogen also known as Volatiles, and exhale Nitrous Oxide.
This makes it hard for them to coexist with plants and Humans because Hydrogen and Oxygen when they mix will Combust, and Explode. So its advisable to make them wear a suit outside of a living quarters made just for them to avoid having Oxygen and Hydrogen potentially mixing in the air.
Starting Equipment
Same as a Human but with a Tank full of Volatile Gas instead of Oxygen to breath, and Filters for Nitrous Oxide instead of CO2 or Carbon Dioxide.