Setting up those powers, sentences or random events can be hard but maybe by inviting the students, it can give you a better perspective on what everyone would like to see. This is a document that I made for each role, so these kids can help you out a bit.
The document is in Dutch but you can easily change every aspect of this document to fit your needs. Hopefully this helps out a bit!
Suggesties are Dutch for "suggestions"; Goed => I like it! Niet goed => I don't like it.
This is the link from WeTransfer: