The rules are simple: Create a superpowered individual that you think would be a good match against the one above you. For example, perhaps there is a wind based superhero, well, then, maybe a vacuum based super villain would do the trick against them. Focus more on their powers than other aspects of a CS. Don't make them too powerful, otherwise it won't be about anything but raw power. Think like a 6 out of 10 in terms of power level, with superman being a 10. Feel free to use the Superpower Wiki for inspiration! Have fun and be nice!