Arcos

Arcos is a genius and socially awkward mouse. He lives adjacent to the overgrown library and is perhaps the only creature that even knows of its existence. He doesn't fear Wildcat Vorskar, and occasionally brings unwanted attention to Red Sky Colony through his reckless behavior. This puts those around him in difficult positions, because it’s this same reckless genius that allows the colony to survive.
Though the rest of the known galaxy has atrophied technologically, he has not. Thanks to his ability to correct an inherent design flaw in the terraformers, the Red Sky planet avoided complete destruction when The Darkening happened.