By any measure in publishing, cartoonist Dav Pilkey is a rock star. The children’s author created his characters Captain Underpants (a superhero for grade-schoolers) and Dog Man (a hound-supercop) while an Ohio second-grader, sitting alone in the hall during class as a result of his ADHD.

Now Pilkey is 53, and “Dog Man” — a franchise that has sold millions — is perched atop the New York Times bestsellers list for children’s series, while “Captain Underpants” is at No. 8 (both books have sat on the list for years)….

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