The female protagonist is the end of the world, the male protagonist is not human
This type of novel often involved the relationship between humans and extraterrestrials. The female protagonist usually played the bridge and link between humans and extraterrestrials. The male protagonist could be a non-human existence such as a vampire, a werewolf, a giant, and so on. The common plot of the female protagonist's doomsday novel included: the female protagonist as a human being surviving with other creatures after the doomsday. In the process, she gradually became stronger and finally met the male protagonist to explore the truth of the doomsday and find a way to survive. The non-human existence of the male protagonist usually brought more complicated and mysterious plots to the novel, making the readers more involved in the story. These characters usually had unique powers and abilities that allowed them to face the challenges of the apocalypse together with the female protagonist. Doomsday novels with the female protagonist and the non-human existence of the male protagonist were very common plots in online novels, and they were also the type that many readers liked.