User blog comment:Tsuru23/Seijin/Alien/@comment-5527544-20121201165941

Actually Yaoyao9 you're mostly correct Seijin comes from two Japanese words Seikai meaning World or planet and Jin meaning person/man. Jin can be replaced with Jinbei meaning people/humanity making the word singular and plural. Thus saying Baltan seijin means directly in english Baltan planet person/people or a person from planet Baltan etc. Its a word that would only be used for aliens so alternating between Seijin and Alien is correct. Uchujin means space man/person and would be used to any alien in general while the alien names refer to their world of origin so seijin would be the proper term to use