Hey, I had to revert your edits. As we don't need an "alien" category on the pages as far too broad of a criteria to warrant it. Instead we have categories based on specific alien races such as and. We only create species specific categories if there are three or more named characters who belong to them.
Category creation can be difficult though! If you have any ideas or interests in creating new categories please contact me first before adding it to the pages, as removing unnecessary content can sometimes be tedious.