The Legend of the Sword and Fairy is a famous TV series and game, while the descendants of Nüwa and the Sage Nun are fictional characters that only appear in TV series and games. Creating fictional characters and plots was allowed as part of the creation of a novel. However, copying or borrowing the plot or characters of a TV series or game directly in a novel might be considered plagiarism. Therefore, if you intend to write a novel, you should study it carefully and respect the existing works.