In these fanfics, a common theme is the re - writing of Hermione's social standing. Since she's now a pureblood, she might be thrust into a different social circle. This could lead to themes of social climbing or resistance to it. Another theme could be the exploration of the pureblood culture. How does Hermione adapt to the traditions, values, and expectations of the pureblood society? And of course, there's always the theme of self - discovery. As she learns about her new identity as a pureblood, she also discovers new aspects of herself, her magic, and her place in the wizarding world. It can be really fascinating to see how different authors handle these themes in their fanfics.