A 'Harry Potter adopts Naruto' fanfiction could see Naruto being amazed by the magic of the wizarding world. He might constantly ask Harry about how everything works. Harry would have to explain things like the Floo Network and thestrals to him. Naruto could also share his stories of the Hidden Leaf Village with Harry and his friends. This could lead to new friendships being formed, like Naruto becoming good friends with Ron and Hermione. And perhaps Naruto would use his shadow clone jutsu to help out during Quidditch matches, either by confusing the opposing team or helping to search for the Snitch.
Well, Elrond could use his ancient wisdom to train Harry in magic that's different from Hogwarts. Maybe he'd teach Harry about elven magic, which could give Harry an edge in fighting Voldemort. Elrond's knowledge of ancient spells and potions could be a great asset to Harry.
In such a fanfiction scenario, Harry might be exposed to a very different upbringing. Lucius could try to indoctrinate Harry with pure - blood supremacist ideas at first. But as time goes on, Harry's strong sense of justice might conflict with Lucius's beliefs. Maybe Harry would gradually change Lucius's view on Muggle - borns, or he could use his influence within the Malfoy family to bring about some positive changes in the wizarding world's view on blood purity.
In this kind of fanfiction, Percy could introduce Harry to a whole new world of Greek mythology. Harry might learn about demigods and their powers. Percy could help Harry better understand his own magic in a different way, maybe by comparing it to the powers of the demigods. Also, Harry would probably be introduced to Camp Half - Blood and make new friends there.
If Sally Jackson adopts Harry Potter in fanfiction, it could be really interesting. Sally is such a loving and strong mother figure. Harry would probably have a more stable home life compared to what he had with the Dursleys. He might also get to know Percy Jackson and they could share their magical experiences. And who knows, he could end up being part of some epic quests involving both the wizarding world and the world of Greek mythology.
In such a fanfiction, Harry might see the potential in young Severus that others overlooked. He could protect Severus from the bullies at Hogwarts. Harry, having experienced his own share of hardships, would understand Severus's situation to some extent and try to give him a better childhood, perhaps even guiding him to use his magic in a more positive way.
Well, in such a fanfiction, Alaric could use his knowledge to help Harry with his magical studies in a different way than at Hogwarts. He might introduce Harry to some new forms of magic or ways of defending himself that are more in line with his own experiences.
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.
The story could start with Harry finding Naruto in some sort of strange situation, like he accidentally gets transported to the wizarding world. Then Harry decides to take Naruto under his wing. As they spend time together, Naruto would start to learn about magic, and Harry would learn about Naruto's ninja skills. Their friendship would grow, and they would face various challenges together. Maybe they would have to deal with a dark wizard who is interested in Naruto's unique abilities. And along the way, Naruto would make friends with other Hogwarts students, like Neville, and they would all learn from each other.
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.
In this kind of fanfiction, Naruto might teach Kawaki about the values of the Hidden Leaf Village. Maybe he'd show Kawaki how to control his powers better. For example, Naruto could take Kawaki on training sessions similar to the ones he had with Jiraiya.