Ultraman Doujin novels did not write about the monsters in Ge Lei's Ultraman for the following reasons: The plot and setting of the Ultraman series had been widely accepted and recognized, so the creators were unwilling to change the setting that had already been deeply rooted in the hearts of the people in the novel. The creators might think that changing the plot and setting of the Ultraman series would affect the image and reputation of the entire series, so they were not willing to take the risk. The monsters and abilities in the Ultraman series are already very colorful, so the creators may not be willing to add new monsters to the novel. The creation of Ultraman Doujin novels required many factors to be taken into account, including the storyline, character image, setting, reputation, and so on. Creators needed to maintain the image of the Ultraman series to carry out innovation and exploration in order to create popular works.