Let me ask you a question:
If they were to do a Miraculous "Storybook" special, what would you want it to be?
What i mean by storybook, is that they are taken inside of a book and either:
A: take up the roles of the characters
B: Be the special heroes to save the world of said story.
Take the Sonic storybook series for example. ("The Secret Rings" and "The Black Knight")