In each Kanzenban (volume) of JoJonium, there is a section in the back of the book containing an interview with Hirohiko Araki discussing the character featured on the cover. These interviews act as small biographies outlining the creation process of said character and Araki's thoughts at the time. The pages also include a picture of the character, their profile, and a one question Q&A regarding the character design choices of the cover illustrations.