Perhaps she travels between the two universes. In the Naruto world, she learns more about her kitsune abilities and then brings that knowledge back to the Harry Potter world. She could then use her new skills to reform Hogwarts' magic system or something like that. There could also be a plotline where she teams up with Naruto characters in the Harry Potter world to defeat common enemies that somehow cross over from both universes.
One possible plotline could be that the female Harry Potter, with her new kitsune powers from the Naruto universe, uses them to fight the dark forces in the Harry Potter world in a different way. For example, she might use her kitsune illusions to deceive Voldemort.
One possible plotline could be that the female Harry Potter stumbles upon Naruto's world through some sort of magical accident. She then realizes Naruto's situation and decides to take him under her wing, teaching him about magic in the process. Another could be that she is sent on a mission to Naruto's world for some magical reason and sees Naruto's potential and adopts him as her protege to help him grow stronger both in ninja skills and, with her help, in magic as well.
One plotline could be Naruto being a transfer student at Hogwarts. He might struggle to adapt to the magic system while also showing off his ninja skills. Another could be Naruto teaming up with Harry Potter to fight a common enemy that threatens both the ninja world and the wizarding world.
A plotline could involve Naruto's Kitsune heritage being related to some ancient mystery in the Inuyasha world. For example, there could be a prophecy about a Kitsune from another world coming to save the Inuyasha world from a dark force. Naruto then has to discover his true role in this prophecy, all while dealing with the mistrust and different personalities of Inuyasha, Kagome, and the others. There could also be some romantic sub - plots, like Naruto developing feelings for one of the female characters in the Inuyasha world or vice versa.
One possible plot twist could be that the female Harry Potter's kitsune nature is kept a secret from her friends at Hogwarts for a long time, and when it's finally revealed, it causes a rift in some of her relationships because they don't understand or are afraid of her new form.
One possible plotline is that Harry is magically transported to the Naruto world and discovers Naruto is in danger from a new, powerful enemy. Harry then uses his magic to fight alongside Naruto and his friends, saving Naruto in the process.
One interesting plotline could be the main character inheriting kitsune powers and how it affects their relationships at Hogwarts. Maybe they have to hide their new abilities from their friends at first.
Perhaps the story could revolve around the Fem Kyuubi teaching Naruto more about his Kitsune heritage. This could include special jutsu or abilities that only those with Kitsune blood can learn. The plot might also involve Naruto having to protect the Fem Kyuubi from other ninja who fear her power and want to seal her away again.
One possible plotline could be that the female Harry Potter somehow ends up in the world of Fullmetal Alchemist and meets Colonel Mustang. They could team up to fight a common enemy that has elements related to both their worlds, like a dark wizard using alchemy for evil purposes.
Well, I'm not really an expert on this particular type of fanfiction. However, you might want to join some Harry Potter and Naruto fan communities on social media platforms or forums. People there often share and discuss interesting fanfictions, and you may be able to find what you're looking for.
Well, a big theme is the combination of different magical elements. The magic of the Harry Potter world and the unique abilities of a kitsune. There's also the theme of relationships. How does her being a female Harry Potter with kitsune powers affect her relationships with Ron, Hermione, and others? Some stories might also have a theme of self - discovery, as she figures out what it means to be a kitsune in the context of the wizarding world and how it changes her view of herself.