The NMS-RPG System is essentially player-created fanfiction but created in a way which allows it to be linked with the game itself.

For an exhaustive guide, see:

• Guide to the NMS-RPG System: https://nmsgalactichub.miraheze.org/wiki/Guide:NMS-RPG_System
• Guide to the Galactic Hub Project World: https://nmsgalactichub.miraheze.org/wiki/NMS-RPG:Galactic_Hub_Project