Have you ever thought about making a parody with your favorite South Park ships or characters? I mean, I mean doing a Crossover cosplay, for example, do you know the Kamen Rider franchise?
Could you do as my suggestion based on using the main group and drawing them dressed as Kamen Rider?
Of course it's just a suggestion and an example, I'm leaving it up to your interpretation, for example you could make a parody of, I don't know, Kimetsu no Yaiba or X-men so to speak, of course whatever you know and like you can make whatever parody you want. , but like I said it's just my suggestion.