Literature and science fiction have created a wealth of gentilics that are not directly associated with a cultural group. These will typically be formed using the standard models above. Examples include Martian for hypothetical people of Mars (credited to scientist Percival Lowell) or Gondorian for the people of Tolkien's fictional land of Gondor or Atlantean for Plato's island Atlantis.
Other science fiction examples include Jovian for those of Jupiter or its moons, and Venusian for those of Venus. Fictional aliens refer to the inhabitants of Earth as Earthling (from the diminutive -ling, ultimately from Old English -ing meaning "descendant"), as well as "Terran", "Terrene", "Tellurian", "Earther", "Earthican", "Terrestrial", and "Solarian" (from Sol, the sun).
Fantasy literature which involves other worlds or other lands also has a rich supply of gentilics. Examples include Lilliputians and Brobdingnagians, from the islands of Lilliput and Brobdingnag in the satire Gulliver's Travels.
In a few cases, where a linguistic background has been created, non-standard gentilics are formed (or the eponyms back-formed). Examples include Tolkien's Rohirrim (from Rohan) and the Star Trek world's Klingon people (with various version of homeworld name).