Well, one way this could work is through some sort of magical time - travel or alternate universe scenario. Maybe in a world where magic and the Marvel universe collide, Bucky Barnes somehow ends up in the wizarding world and has a relationship with a witch, resulting in Harry Potter. It would be really interesting to see how Bucky's skills and experiences would influence Harry's upbringing and his adventures at Hogwarts.
This fanfiction idea is really out - there but cool. If Harry was the son of Bucky Barnes, we could also see a different side of the wizarding world's politics. Bucky has a history of being involved in complex power struggles in the Marvel universe. Harry could bring that perspective to the wizarding world. Maybe he'd be more suspicious of Dumbledore's actions or more likely to question the Ministry of Magic's motives. Also, his relationship with his friends could be different. Hermione might be intrigued by his unique background and Ron might be a bit jealous at first, but they'd all grow together in new and unexpected ways.
A possible storyline could be that the wizarding world is in danger not just from Voldemort but from some sort of threat from the Marvel universe as well. As the son of Bucky Barnes, Harry is seen as a link between the two worlds. He has to bring together the magic of Hogwarts and the skills he has from his father to save both worlds. He might form an alliance with some Marvel characters who find their way into the wizarding world. This would create a really unique and exciting adventure, full of magic, action, and unexpected twists.
One way to blend these worlds in a fanfiction is to have a time - travel or dimension - hopping plot. Suppose Bucky Barnes, while on a mission in the Marvel universe, gets caught in a strange energy wave that transports him to the Harry Potter world. There, he meets Harry Potter. Meanwhile, Steve Rogers follows to find Bucky. They find out that there are similarities between the two worlds in terms of good vs. evil battles. They then work together with Harry and his friends to fight against the dark forces in the Harry Potter world, and in the process, they bring some of their own ideas and values from the Marvel universe, like the importance of freedom and justice.
Well, in a fanfiction scenario, Harry Potter's magical world and Bucky Barnes' superhero world could collide in many ways. Maybe the magic of Harry Potter could be used to heal Bucky's mental and physical scars. For example, a spell like 'Episkey' might be used to fix some of his physical wounds. And Bucky could introduce Harry to the concept of modern technology and warfare, which would be completely new to Harry.
The concept could work by having Harry bring the magic of the wizarding world into the Avengers' realm. His knowledge of potions could be used to create elixirs that give the Avengers new abilities. He could also use his wand to control the elements, like Thor does with his hammer, but in a more magical way. This would make him a valuable and almost god - like addition to the team.
There are. Fanfiction often plays with the idea of crossovers. A female Harry Potter in a story with Bucky Barnes can lead to all kinds of creative scenarios. For instance, they could be transported to a new dimension where they have to rely on each other's skills. Her magic and his combat abilities would make for an exciting combination as they face various challenges together.
Another challenge is appealing to fans of both franchises. Fans of Harry Potter may be very particular about how their beloved characters are used, and the same goes for fans of Bucky Barnes. The writer has to find a balance so as not to alienate either group while still creating an interesting and unique story that involves this strange crossover and the mpreg concept.
One idea could be a crossover where the magical world of Harry Potter intersects with the superhero universe of Steve Rogers and Bucky Barnes. Maybe Harry and his friends accidentally end up in the Marvel universe and team up with Steve and Bucky to fight a common enemy. It could be an interesting exploration of how magic and super - strength work together.
One potential storyline could be Bucky being brought into the wizarding world by a magical accident. He then has to learn about magic from scratch. He might befriend Harry and they could train together, with Bucky teaching Harry some of his combat moves and Harry teaching Bucky magic. Another could be Bucky being on a mission in the wizarding world for some reason related to his past in the Marvel universe, and getting caught up in the fight against Voldemort.
First, you need to know both universes well. Read the Harry Potter books and watch the movies, and also be familiar with the story of Bucky Barnes from the Marvel universe. Then, think of an interesting premise. For example, you could start with how Bucky ends up in the wizarding world. After that, focus on character development. How would Bucky interact with Harry, Hermione, and Ron? What would they think of him? And don't forget to have a plot with a beginning, middle, and end.
You can start by checking out some popular fanfiction websites like Archive of Our Own (AO3). Just use the search function and type in 'fem Harry Potter and Bucky Barnes'. It has a wide range of stories with different themes and ratings. Another option is FanFiction.net, although the tagging system might be a bit different there, but you can still search for relevant stories.