Who are the minor characters in that was then this now?

In "That Was Then, This Is Now" by S.E. Hinton, minor characters include the likes of M&M, a young friend of Bryon and Mark who is portrayed as innocent and somewhat naive. There's also Charlie, who serves as a mentor figure and provides a glimpse into the adult world. Additionally, the characters of the various gang members and the boys' families contribute to the novel's exploration of friendship, loyalty, and the challenges of growing up. These characters help to enrich the story and underscore its themes.