A plot could revolve around a prophecy that involves both the wizarding world and Asgard. Harry is the key figure in the prophecy. He travels to Asgard to find out more. There, he meets Odin who initially distrusts him. But as Harry proves his worth through his magical abilities and courage, Odin decides to help him. Together, they must face a common enemy that is emerging due to a dark magic that is seeping between the two worlds. Harry could also form a friendship with Sif, who teaches him some Asgardian fighting techniques.
Here's a plot idea. A powerful Asgardian spellbook is stolen and ends up in Hogwarts. Harry and his friends find it and start to study it, unknowingly causing some strange magical disturbances. The Asgardians, led by Thor, come to Hogwarts to retrieve the book. However, they realize that a dark wizard at Hogwarts has been using the book to gain power. So, Harry, Thor, and their respective friends join forces. They have to navigate the differences in their magic systems to stop the dark wizard and return the spellbook safely to Asgard.
One interesting plot idea is when the magic systems of Asgard and Hogwarts collide. For example, the use of seiðr (Asgardian magic) in the wizarding world of Harry Potter. Another is characters from Asgard attending Hogwarts. Imagine Loki causing chaos in the halls of Hogwarts or Thor trying to fit in with the wizards.
Maybe Harry Potter arrives in Wakanda after a failed attempt on his life in the wizarding world. The Wakandans see his magical abilities and believe he is sent by their gods. They make him king. He then uses his knowledge of potions to create new substances that can enhance the properties of Vibranium. But there are some within Wakanda who oppose him, thinking he will bring chaos with his foreign magic, and he has to win them over.
She could be sent to Forks as part of a cultural exchange program between the wizarding world and the world of Twilight. Once there, she has to adapt to the new environment while also dealing with the fact that she's a magic - user in a place full of vampires and werewolves. She might start a school for magic in Forks, teaching the locals some basic spells and in turn, learning about their way of life.
One plot idea could be that a powerful dark magic causes a rift in time and space, bringing Harry and Lyanna together. They initially clash due to their different backgrounds but gradually fall in love as they fight against the dark magic that brought them together. Another idea is that Harry, while exploring some ancient magic in Hogwarts, accidentally travels to Westeros and meets Lyanna. They bond over their shared sense of justice and adventure, and their marriage unites the magical world of Harry with the political world of Lyanna's family.
One possible plot is that Voldemort somehow has a connection to an Asgardian villain. Harry, being the hero, travels to Asgard to find a way to defeat Voldemort once and for all. Along the way, he meets the Asgardian gods. They initially doubt him but soon realize his strength. Harry then combines his wizardry with Asgardian magic to face the dual threats of Voldemort and the Asgardian foe.
One idea could be a story where a mistress is a strict but kind teacher at Hogwarts. She could be in charge of a special class that focuses on ancient magic spells, and the story could follow Harry and his friends as they struggle and learn in her class. Another idea is a mistress who is the caretaker of an old wizarding manor. Harry and his friends visit the manor for a school project and discover all kinds of magical secrets under her guidance.
A Harry Potter and Asgardian fanfiction could be really exciting. It might involve Harry Potter being magically transported to Asgard. There, he could learn about the Asgardian magic and culture. Maybe he would meet Thor and they would go on an adventure together to fight some dark force that threatens both the wizarding world and Asgard.
One plot idea could be that Hermione, through some magical accident, gets transported to Asgard. She could use her intelligence and magic skills to solve problems in Asgard, like helping with a mysterious plague that is affecting the Asgardians. Another idea is that she teams up with Thor and Loki. She and Thor could bond over their sense of justice, while her cleverness could intrigue Loki and they could have a complex relationship as she tries to figure out his true motives.
Harry could be seen as a strange but powerful being. His Gryffindor courage would be respected in Asgard. Hermione might be seen as a great scholar, like the Asgardian mages. Ron could be the loyal friend who has to adapt to the grandeur of Asgard.
One plot idea could be that they face a villain who has the ability to disrupt the balance of nature and technology. Spiderman, with his knowledge of the city's infrastructure, and Ororo, with her connection to nature, have to work together to stop this villain. Their marriage is put to the test as they struggle to combine their powers effectively in the face of this threat.