HEM Droid
From Unofficial Stationeers Wiki
The H.E.M Droid is a DLC alternative playable species. They are these robots that are designed to survive out in the Hazards of Space as such do not require a suit to survive or air to breath.
Features
Consume power via batteries rather than Breathing or Eating. The battery slot replaces your Uniform Slot (Pocket slot (#5) and where you are able to equip any battery cell to remain powered, You start with a fully charged large battery inserted by default. Not having a Battery in your slot or having a empty Battery in the slot will cause you to begin to lose Consciousness until you pass out.
HEM Droids are Very susceptible to cold temperature damage as power drains faster in the cold but not the Heat making them a good species in places like Vulcan or Venus. While you may not require a space suit, Its ideal to wear a Space Suit or Headlamp since HEM Droids are still susceptible to the Cold. And While HEM droids do have Nightvision by default which can be Activated/Deactivated with the click of the N Key (That being the default binding). Nightvision can be rather hard on the eyes and make it hard to distinguish color of ore for example.
While they may be resilient to temperature extreme's tools and suits used, and worn by them can still melt.