Well, in this fanfiction, Kakashi might introduce Harry to the concept of chakra. Since Harry has magic, Kakashi could find a way to combine the two powers. Maybe Harry would learn to use chakra to enhance his spell - casting speed or accuracy. And Kakashi would also help Harry deal with his emotional traumas, like the death of his parents, in a more ninja - like, stoic way.
Perhaps the story could start with Kakashi somehow being transported to the Harry Potter universe. He takes Harry under his wing because he sees the potential in him. Kakashi would then take Harry on various adventures outside of Hogwarts, where they encounter different magical and non - magical creatures. Along the way, Kakashi instills in Harry his own values of loyalty, friendship, and perseverance, which would be different from what Harry has learned in the wizarding world, and this would shape Harry into a more well - rounded and powerful wizard.
One possible plot could be that Kakashi somehow gets transported to the Harry Potter world. He could then teach the students at Hogwarts some ninja techniques, like stealth and hand - to - hand combat. Harry could be his star pupil, learning from Kakashi how to better sense danger and use his instincts. Together, they could form a new kind of defense against the dark forces in the wizarding world.
Well, perhaps the plot could involve Harry having to fend for himself from a very young age in the wizarding world. He might have to figure out magic on his own, without much guidance from adults. Maybe he starts exploring the secrets of Hogwarts by himself earlier than in the original story, leading to all sorts of unexpected adventures.
One possibility could be that Harry, with his knowledge of magic and experience in fighting dark forces, takes Tsuna under his wing in the magical world. He could teach Tsuna about different spells and how to handle magical creatures, which would be a new and exciting experience for Tsuna who is used to his own world in 'Katekyo Hitman Reborn!'.
Well, in this fanfiction, Deadpool might raise Harry Potter in a world where the two universes collide. Deadpool could introduce Harry to the concept of fourth - wall breaking, which would be really strange for Harry. He could also take Harry on adventures that involve both the wizarding world and Deadpool's own crazy world filled with mercenaries and mutants, leading to some really unique and comical situations.
Maybe Harry starts raising chickens because he wants to have a normal, non - magical hobby. He finds some regular Muggle - like chickens in a nearby village. As he raises them, he realizes that they have an uncanny ability to sense dark magic. So, they become like an early warning system for any approaching danger at Hogwarts. This could lead to all sorts of adventures where Harry has to protect his chickens from dark wizards who want to use their power for evil.
In such a fanfiction, Harry might raise Naruto in a way that combines the values of both the wizarding world and the ninja world. He could introduce Naruto to the concept of different magical creatures, which Naruto could then try to incorporate into his ninja training. Maybe Naruto would learn how to communicate with magical animals like Hedwig, and use that knowledge to better understand the summons in his own world. Also, Harry could help Naruto with his studies, which would be a huge change for Naruto who wasn't that good at traditional schoolwork at first. This would not only make Naruto more well - rounded but also give him an edge in the ninja world with his new - found knowledge.
Well, perhaps Harry could inherit some of Kakashi's ninja skills along with his wizarding abilities. He might use his Sharingan (if he inherits it) to detect magic in a different way or use ninja stealth in the wizarding world. Maybe he would be an outcast in both worlds, not fully fitting into the wizarding society because of his ninja - like traits, and not fully accepted in the ninja world because of his magic.
It could be that Harry, after the defeat of Voldemort, is bored with the wizarding world and somehow stumbles upon a portal to the Naruto universe. There he meets Kakashi and is so impressed by his cool demeanor and powerful jutsu that he decides to become his apprentice in a way, learning about chakra and how to use it in the context of his own magic.
At first, Harry might be a bit skeptical of Kakashi. But as Kakashi starts to show him new skills and ways of thinking, Harry would grow to respect him. Kakashi, on the other hand, would see Harry as a young protege with great potential.
In such a fanfiction, perhaps Harry Potter feels a sense of duty to raise Delphini despite her being Voldemort's daughter. He might see her as a chance to break the cycle of dark magic. He could raise her with the values of love and friendship, trying to turn her into a force for good in the wizarding world.