One great fem Harry Potter crossover Naruto fanfiction is 'The Potter-Namikaze'. It combines the magic of the Harry Potter world with the ninja skills of Naruto. The story follows a female Harry Potter who somehow ends up in the Naruto universe and has to adapt. It's full of interesting character interactions and unique plot twists.
One idea could be that Naruto's immortality is due to some sort of ancient ninja magic that has parallels to the magic in the Harry Potter universe. For example, he could have made a pact with a powerful magical creature in the Naruto world that gives him eternal life, and when he enters the Harry Potter world, he has to figure out how this magic works there. Maybe he tries to find a way to share his immortality with his new friends in Hogwarts, like Harry, Hermione, and Ron. He could also use his ninja skills along with his immortality to protect the wizarding world from new threats that the regular wizards are not equipped to handle.
Maybe in this fanfiction, the Death Eaters are somehow connected to an evil ninja clan in the Naruto universe. Harry and Naruto then have to team up to fight against this combined threat. Naruto could teach Harry how to use chakra to enhance his physical abilities, and Harry could show Naruto some of the more subtle uses of magic, like invisibility spells that could be useful for stealth missions.
Shisui could be a protector. Just as he was loyal to his village in Naruto, he could be protective of Hogwarts in the fanfiction. He might use his Sharingan to detect any hidden threats or dark magic. For instance, if Death Eaters were planning an attack on the school, Shisui could sense their intentions and warn the professors and students.
One common theme is the clash and combination of different power systems. The magic from Harry Potter and the chakra - based abilities in Naruto are often explored in terms of how they interact. For example, a fem Harry might try to use a spell in the Naruto world and see unexpected results.
Well, perhaps Harry Potter, with his knowledge of magic and a big heart, finds Naruto in the wizarding world. Maybe Naruto's chakra could be seen as a unique form of magic there. Harry could take Naruto under his wing, teach him about the wizarding ways, and Naruto could in turn show Harry some of his ninja skills. They could team up to fight dark wizards and evil ninja forces that somehow cross over into each other's worlds.
A Naruto and Harry Potter crossover with the Sharingan involved would bring a whole new dynamic. The Sharingan's powers of perception and the ability to copy techniques could be adapted in the magical realm. The fanfiction could explore how a ninja's training and skills would fare against the magic of the wizarding world. There could be a lot of cultural clashes as well. The ninjas' values and ways of life are quite different from those in the wizarding world, and this could lead to some really engaging story arcs where they learn from each other and grow.
Well, it could be about Harry Potter using some Naruto - style jutsu in Hogwarts. Maybe he could learn how to do a shadow clone jutsu to help him with his studies and his adventures against Voldemort. And Naruto, if he were in the Harry Potter world, might be sorted into Gryffindor for his brave nature.
Perhaps there could be a plot where a powerful dark wizard in the Harry Potter universe creates a spell that merges the two worlds. This causes chaos as ninjas and wizards start to clash due to misunderstandings. Naruto and Harry, realizing the danger, form a group of their friends from both worlds. They include Hermione, Ron, Sasuke, and Sakura. Together, they try to find a way to reverse the spell while also learning from each other. Naruto teaches the wizards about chakra control, and the wizards teach the ninjas about potions and magical creatures.
One interesting female Harry Potter Naruto crossover fanfiction could be 'The Magic of Shinobi'. In this story, the female Harry Potter character finds herself in the Naruto universe and has to adapt to the ninja way. She uses her magic skills in unique ways within the context of the Naruto world, like using spells to enhance her ninja training or to outwit opponents in battles.