User blog:Razgriz Ghost/Potential Future-Rank Themes

Hello, everyone, and I hope you know what the title says. Lots of people think that at least one new rank will come up. However, I think that the ranks are finished, as there has to be an end, and a "space theme" usually marks it.

Nevertheless, I would like to hear your ideas on what themes the next ranks could be themed about, if they are to come.