Also, I want to have sketchbooks done in advance, but everything I'd naturally sketch for practice is a spoiler a the moment, so any zappy suggestions for sketchbook entries?
Well, it might not be very creative, but how about some TG pics of those who haven't been subjected to it yet? Like f-Greg, or m-Rhoda.
If you don't feel like doing that old bit again, maybe you could zap that Duck kid with a duck-form. Or how about pictures of the main cast as little kids. Or you could go for all-out adorable and draw Akiko the Cookie Fairy.