Mik Davies was the author of the Underpants Bandits series, about 2 boys stealing historical undergarments.
He is mentioned in Diary of a Wimpy Kid: The Long Haul when Greg is given an assignment to pick an author to write about. All of Greg's classmates, especially the boys chose him to write to, but the teacher Mrs. Terry made them pick someone else. On the eighteenth of August, Greg wrote to him saying that he should not listen to his critics about the rude humor present in his books as he personally likes it and encourages him to right more about bodily functions in his book. Close to a year later, Mik wrote back in a letter which said "Dear friend, Unfortunately I get so much fan mail that I'm not able to answer your letter personally. But I did want to tell you to be on the lookout for "Underpants Bandits 24: Lincoln's Longjohn's", coming soon to stores near you! Lots of yuks, Mik."
- He is possibly based from real-life Captain Underpants author Dav Pilkey.