by Matt Peters   Content advisory: Bullying and gun violence in the book’s final section   On top of their usual heroics, many of Marvel’s characters have had short-term roles promoting a variety of social causes and educational campaigns. Sometimes these secondary roles have been worked into their regular serial publications, usually at the volition of writers who want to address issues that are important to them personally. For example, in The Incredible Hulk #420, released in 1994, writer Peter David promoted AIDS awareness in a story that saw Hulk lose a close friend to the disease. Other times Marvel… Read More