There's a wide range of subjects in this generator, most of which are fantasy-related, but some could be real today or in the future, like many of the space-related subjects. You'll also find I used 'alien' and 'foreign' often and as two different terms. Alien is meant mostly as life not from the main planet, whether that's Earth or your fictional planet will depend on your story of course. Foreign is meant more as different species that do occur on the same planet.