In these fanfictions, the theme of loyalty is quite prominent. Hermione would be torn between her loyalty to her new - found Malfoy family and her old friends like Harry and Ron. Another theme is change. Lucius would have to change his views about Muggle - borns, at least in relation to Hermione. And for Hermione, her life would change completely in terms of social status, access to resources, and family expectations. The theme of self - discovery also exists as Hermione delves into her new family history and discovers new aspects of herself related to the Malfoy heritage.
The themes often include prejudice. Hermione, being related to Lucius, might face different types of prejudice, both from those who hate the Malfoys and those who despise Muggle - borns. There's also the theme of acceptance. Lucius has to accept Hermione as his daughter, and Hermione has to accept her new family. Additionally, power dynamics play a role. The Malfoy family has power and influence, and Hermione's place in that power structure would be explored in these fanfictions.