In my LibraryThing collection, I have Science Fiction and these subgenres: Alternative History, Dystopian, Martians, Robots/A.I., Star Wars, and Superhuman. I'm thinking of adding something for Aliens, but most of them would be Martians or Stars Wars aliens, and I already have a UFO/Aliens genre for nonfiction titles. Martians can include natives of Mars or people who come from Mars, such as Stranger in a Strange Land. Superhuman/hero can include mutants (Odd John), cyborgs (Alita: Battle Angel), enhanced humans (Flowers for Algernon), and superheroes (DC and Wild Cards books).
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