A plot could involve time - travel. Harry, for some reason, is sent back in time and meets a younger Narcissa. He gets to know her before she becomes involved with the Dark Arts. They form a bond, and as Harry tries to change the future to prevent some of the tragedies in the wizarding world, their relationship deepens. Eventually, they marry in this altered timeline, and Harry has to deal with the consequences of changing the past and his new relationship with Narcissa.
One possible plot could be that in a world where the war ended differently. Harry, having seen Narcissa's true nature in saving him at the end, starts to interact with her more. They find common ground in their love for Draco and a desire to heal the wizarding world. Their relationship slowly blossoms from there, with Harry helping Narcissa come to terms with a new world order, and Narcissa teaching Harry more about the pure - blood traditions in a non - prejudicial way.
Sure, there are often fanfictions that explore unexpected pairings. In the case of Harry Potter and Narcissa Black, it would be a very different kind of story compared to the original series. It might involve a lot of alternate universe elements, like changing the circumstances of their meeting, or reimagining their personalities in a way that makes such a relationship plausible.
Well, perhaps it could involve Harry Potter breaking away from the traditional wizarding world norms. Maybe he meets a Black family member who is a strong and independent witch. They could bond over their shared experiences of dealing with the dark side in different ways. Their relationship might start with mutual respect and admiration, which then blossoms into love.
One possible plot twist could be that Harry's connection to Narcissa changes his relationship with Draco. Instead of being rivals, they could be reluctant allies, with Draco feeling a sense of family loyalty towards Harry. Another twist might be in how the wizarding world reacts. Some might suspect that Harry is now a part of some dark plot due to his Black family connection. And the magical abilities he inherits from the Black family could be different from what he has as a Potter, leading to new challenges and adventures as he tries to master them.
One possibility is that it could explore the complex family dynamics. Harry, being an outsider, would have to navigate the Black family's dark and proud history. Maybe he first befriends one sister and through her gets to know the others. It could also involve him using his own experiences of loss and friendship to heal the rifts within the Black family.
It could be Sirius Black's younger sister who was not mentioned in the original series but is created for the fanfiction. She might have similar rebellious traits as Sirius but also her own unique charm that attracts Harry.
A 'Harry Potter marries Supergirl' fanfiction might start with Supergirl accidentally landing in the wizarding world. Harry Potter, being the curious and brave wizard he is, approaches her. At first, there are misunderstandings due to their different cultures and powers. But as they start to communicate and learn about each other's worlds, they realize they have a lot in common. They both fight for the good of their respective worlds. This mutual understanding leads to a deep friendship and later, love. Their marriage would be a grand event, attended by wizards, witches, superheroes, and supervillains (the ones who are allowed to come under a truce). It would symbolize the coming together of two very different yet equally amazing fictional universes.
One possible plot could be that after the war, Harry realizes his deep connection with Tonks as they both have lost loved ones and are trying to rebuild their lives. They start to spend more time together, and gradually their friendship turns into love. Eventually, they get married and face the challenges of the post - war wizarding world together.
One possibility could be that in an alternate magical universe, Harry Potter, after all his adventures at Hogwarts and defeating Voldemort, travels to a different realm where he meets a queen. Maybe the queen is facing some magical threats in her kingdom and Harry, with his powerful magic, offers to help. As they work together, they fall in love and decide to get married. Their union could then bring about a new era of peace and cooperation between the wizarding world and the queen's non - magical kingdom.
In the 'Harry Potter marries Blackfire' fanfiction, it could start with Harry being sent on a diplomatic mission to Blackfire's homeland. There, he meets her and is immediately drawn to her strength and intelligence. Blackfire, on the other hand, is initially skeptical of Harry but soon sees his true character. As they work together on some magical problem or task in her land, their relationship grows. Their marriage could then be a symbol of unity between the Hogwarts - associated wizarding world and Blackfire's people. It would also bring about changes in how wizards view different cultures and relationships, as Harry and Blackfire would strive to bridge the gaps between their two worlds.