Well, it could be that Harry accidentally stumbles into Morgana le Fay's realm. At first, they are enemies, but as they get to know each other, they realize they have more in common than they thought. Harry might teach Morgana about the values of the modern wizarding world, like equality among magical creatures. Morgana could in turn teach Harry some ancient and powerful magic. Their marriage would be a symbol of the union between the old and new ways of magic, and they would have to overcome the prejudices of those who believe in the old - fashioned separation of 'good' and 'bad' magic.
The plot might involve a prophecy that brings Harry and Morgana le Fay together. Harry, who is used to saving the wizarding world, sees in Morgana a chance to change the past and prevent some of the dark events she was associated with. Morgana, on the other hand, could see Harry as a way to redeem herself. They would then have to deal with the consequences of their relationship, like the jealousy of other characters and the power struggle within the magical community.
A possible plot could be that Harry starts having strange dreams or visions related to Morgana le Fay. As he investigates, he uncovers evidence of his relation to her. This revelation causes a stir in the wizarding community. Some see it as a sign of great power and potential, while others fear he may turn to the dark side like Morgana was sometimes portrayed. Harry then has to prove himself while also exploring his new - found heritage, perhaps finding a way to use it for good and bring a new era of peace and magic.
Harry would likely become more complex. His understanding of magic and morality would be challenged. He might start to question the traditional views of good and evil that he grew up with. Morgana le Fay could become more empathetic. Through her relationship with Harry, she might see the value in the more modern ideas of the wizarding world. She could start to use her magic in a more positive way.
One possible plot twist could be that Morgan le Fay is not as evil as she seems in the original lore. Maybe she has a good reason for her actions in the past. When she marries Harry, she might be trying to use the union to protect the wizarding world from a greater threat that only she is aware of.
The plot of such a fanfiction could be really interesting. Morgana le Fay being his caretaker means Harry could have a more solitary upbringing. She may not encourage the same kind of social bonds as the Dursleys or Hogwarts would. Harry could be trained in combat magic from a very young age, since Morgana was a powerful sorceress. His moral compass might also be different. He may not have the same values as in the original series, as Morgana's influence could lead him to view power and magic in a more self - serving way, at least at first.
A possible plot twist could be that Fem Harry initially believes Morgana le Fay is a hero, but later discovers that Morgana had a hidden, more sinister agenda all along. This would force Fem Harry to re - evaluate her connection to Morgana's magic and her own identity.
One plot idea could be that Morgana le Fay somehow gets transported to the modern wizarding world of Harry Potter. She could initially be seen as a threat but then turns out to have knowledge that helps Harry in his fight against Voldemort. For example, she might know ancient spells or magic that the modern wizards have forgotten.
I'm not sure if there is such a specific fanfiction. There are countless Harry Potter fanfictions out there, but one with this rather dark and unethical - sounding plot might not be very common. It also might go against the general positive and moral themes of the Harry Potter universe.
The story could also explore the reaction of the wizarding world to Harry's new heritage. Some might be afraid of him, thinking he could turn out like Morgana, who was often seen as an evil sorceress. Others, though, might see it as an opportunity to learn more about ancient magic that Morgana was known for.
There could be. A lot of fanfic writers come up with unique and creative relationships in their stories. Given the popularity of the Harry Potter universe and the allure of Morgana le Fay from Arthurian legends, it's not far - fetched that someone would write a fanfic exploring this relationship. However, it may take some time to find it as there are thousands of fanfics out there.
Power and its proper use is also a common theme. Morgana was a very powerful witch in her own time, and when she enters Harry's world, there are questions about how she will use her power, and whether she will help or hinder Harry. There's also the theme of mystery. Morgana's past and her motives are often shrouded in mystery in these fanfictions, which adds to the intrigue.