One possible plot could be that Harry grows up with a different perspective on the wizarding world. Narcissa might shield him from the more extreme pure - blood ideologies in her own family. He could still have his natural talent for magic but be trained in a more Slytherin - like way, focusing on cunning and self - preservation. And he might have a different relationship with Draco, perhaps more of a brotherly bond.
His personality might become more reserved. Growing up in the Malfoy household, he'd be surrounded by Slytherin values. So he could be more calculating and less impulsive compared to his original self. But he would still have that core of kindness from his parents.
One common theme is redemption. Narcissa was a Death Eater's wife, and in many fanfictions, she tries to redeem herself through her interactions with Harry. Another theme is the blurring of the lines between good and evil. Since Harry represents good and Narcissa was on the 'bad' side originally, their relationship in fanfics often challenges the traditional view of good and evil.
There are many fanfictions on this topic. Some might explore how Narcissa's pregnancy would change her relationship with the Malfoy family and their stance in the wizarding world. It could also show how she might deal with the impending birth during the chaotic times in the story.
One popular type might be those that focus on their relationship within the complex wizarding world. For example, some fanfictions could explore how Narcissa's loyalty to her family and the Dark Lord might interact with Harry's role as the 'Chosen One'. It could show how their paths cross in unexpected ways, like in a political intrigue within the Ministry of Magic where they have to form an uneasy alliance to achieve their respective goals.
There could also be other characters like Draco Malfoy. His mother being in this situation would surely have an impact on him. He might try to rescue her or come to terms with the new dynamic. And then there are Harry's friends, Hermione and Ron. They might have different views on the whole situation. Hermione could be more concerned about the ethical implications, while Ron might be more distrustful of Narcissa at first.
Draco Malfoy is often a very popular character in these fanfictions. Since Narcissa is his mother, his relationship with her and how it is affected by her interactions with Harry can be a major plot point.
In such a fanfiction scenario, Harry might be exposed to a very different upbringing. Lucius could try to indoctrinate Harry with pure - blood supremacist ideas at first. But as time goes on, Harry's strong sense of justice might conflict with Lucius's beliefs. Maybe Harry would gradually change Lucius's view on Muggle - borns, or he could use his influence within the Malfoy family to bring about some positive changes in the wizarding world's view on blood purity.
One possible plot twist could be that Malfoy's family initially objects to the adoption but then slowly comes to accept Harry. For example, Lucius Malfoy might see potential benefits in having Harry Potter, the famous wizard, in their family. Another twist could be that Harry, while growing up with the Malfoys, starts to influence them to be less prejudiced. He might introduce them to his friends from Hogwarts like Ron and Hermione, which would be a huge culture shock for the Malfoy family.
One great 'Harry Potter and Narcissa Malfoy' fanfiction is 'A Different Perspective'. It explores a unique relationship between them in the post - war era. The story delves into how Narcissa's actions during the war might have had deeper implications on her relationship with Harry. It's a really interesting read if you're into exploring the more complex characters in the Harry Potter universe.