Ohio cartoonist David Rickert and I have finished our collaboration on a comic book that helps teach persuasive writing, grades 4-9. It features a female superhero known as “The Persuader” and her sidekick “Bud,” who swoop in and give practical help to two struggling students. It comes with classroom activities and is available in digital (downloadable) form for $10.99, or as a set of 10 printed comic books for 21.95. I'm pretty happy with how it combines humor with practical instruction. You can see a sample of page 5 here or of page 6 here. A two-page activity sample is here.
If you know anyone who might be interested, please pass this along. The comics are available several places, but I'll refer you to these two: