Perhaps a story where Jon Stark's sisters are secretly witches and they meet Harry Potter at Hogwarts. They could share their different cultures and magical abilities, and together they might discover some long - lost magic that is related to both their families' legacies. This could lead to a series of adventures where they have to protect this magic from dark forces.
The fanfiction could start at Hogwarts. One day, a new group of students arrives, and they turn out to be Jon Stark's sisters. Harry Potter is immediately intrigued by their different ways and their connection to a world he doesn't know much about. They start talking, and from there, the story kicks off as they explore each other's worlds and secrets.
One interesting concept could be exploring more about the Marauders' time at Hogwarts. Fanfiction might expand on their adventures, like pranks they played that were never mentioned in the original book. Another could be different interpretations of Sirius Black's escape and his relationship with Harry during that time.
Some fanfictions in Harry Potter 2 might play with the idea of the basilisk having different powers or weaknesses. It could also explore the idea of a hidden connection between Ginny and the Chamber of Secrets that goes beyond what was in the original story. There might be fanfictions that change the role of certain characters, like making Neville a more central figure in solving the mystery of the Chamber.
One interesting concept could be the inheritance of unique magical abilities. For example, a character might inherit the power to communicate with a particular magical creature that was a specialty of their family. Another could be the inheritance of ancient spells or magical artifacts that have been passed down through generations, which then play a crucial role in the story.
One interesting crossover could be a story where Harry Potter uses his magic to travel to the world of Brandon Stark. Maybe he helps Brandon in his struggles against the White Walkers using spells and potions. For example, he could use a warming charm to protect the Stark soldiers from the cold of the North.
One interesting concept could be a magical encounter between Harry Potter's world and Poison Ivy's plant - based powers. Maybe Poison Ivy somehow ends up in the wizarding world and uses her unique ability to control plants to interact with Hogwarts' magical flora. For example, she might be able to make the Whomping Willow behave in a different way or communicate with the Mandrakes.
Perhaps his wings are related to his connection with his Patronus. Since his Patronus is a stag, the wings could be like an extension of that magical energy. They might give him the ability to soar high above Hogwarts and keep an eye on the school grounds, almost like a guardian angel. He could use this newfound ability to sense danger from afar and protect his friends more effectively.
One interesting concept could be Harry Potter's Animagus form interacting with the Leviathan. Maybe his Animagus form is a small creature like a mouse, and it has to find a way to communicate or avoid the Leviathan. Another idea is that the Leviathan has some sort of magical connection to Harry's Animagus ability, like it can sense when he is in that form. Also, perhaps Harry uses his Animagus form to explore a hidden world where the Leviathan resides, and discovers secrets about the wizarding world that were previously unknown.
One interesting concept could be a character from Harry Potter reincarnating in the Naruto world with magic abilities. For example, Harry Potter himself reincarnating and having to learn chakra control while still being able to use some magic. This would create a whole new set of challenges and adventures as he tries to fit into a world so different from his own. Another concept could be a Naruto character reincarnating in the wizarding world, like Naruto becoming a Hogwarts student. He'd bring his ninja skills and values, which would likely clash and also blend with the magical society's norms.
Perhaps a Basilisk Animagus could have a special connection with the other snakes in the wizarding world. In the story, they could communicate with snakes to gather information. This would give them an edge in situations like uncovering plots within Slytherin house, as the snake is the symbol of Slytherin. They might be able to understand the secrets that the snakes around the Slytherin common room are aware of.