Both “Diary of a Wimpy Kid” and “Poptropica” thrive from their use of humor and fun storylines. Looking back, it seems obvious that the two properties were made by the same creator.

Third grade student Rhuanma Leiva, 8, reacts as she draws while Jeff Kinney, author of the Diary of a Wimpy Kid series, looks on at Commonwealth Avenue Elementary School and Commonwealth Gifted ...