The characters don't have any real psychology; they just banter about how to play a video game. As the book's sub-sub-title indicates, this is more tutorial than fan fiction. Unfortunately, the book only covers up to the Sokoban puzzle, which is placed relatively early in the game of Nethack, and the book ends with the line "To be continued..." The downside is that you have to already be experienced as a Nethack player to understand any given sentence in this book, and if you're experienced enough to understand the language of the book, you don't need instructions up to Sokoban.