Well, the plot could involve Kakashi being a transfer student to Hogwarts. He might bring his ninja skills and unique perspective to the wizarding world. Maybe he'd form an unlikely friendship with some of the Hogwarts students like Harry, Ron and Hermione. His Sharingan could be an interesting addition, perhaps having some unforeseen interactions with magic.
In this fanfiction, the plot might see Kakashi being involved in a mystery at Hogwarts. His detective - like skills from being a ninja would come in handy. He could be on the hunt for a dark wizard who has infiltrated the school. Along the way, he'd have to deal with the rules and regulations of Hogwarts, which are very different from what he's used to in the ninja world. His relationships with the Hogwarts professors would also be an interesting aspect, as they try to understand his strange abilities.
Well, one possible plot could be that Naruto, having experienced so much growth himself, decides to pass on his unique ninja skills and values to a young Kakashi. He might teach Kakashi some of his signature jutsus like the Rasengan, but also lessons about friendship and never giving up. Naruto could also share his own experiences of dealing with loss and loneliness, which would be really interesting considering Kakashi's own past traumas.
One possible plot could be that Team 7 stumbles upon a young Kakashi during a time - travel mission. They might initially be shocked to see their sensei as a young boy. Naruto, being Naruto, would probably be super excited and try to befriend young Kakashi right away. Sasuke might be more reserved but also curious about this version of Kakashi. Sakura could be in awe and try to take care of him in a way, seeing as he's just a kid. They could end up having to protect young Kakashi from some sort of danger in the past while also learning valuable lessons about their own sensei's past.
Well, the plot could involve Kakashi bringing his ninja skills to the Fairy Tail guild. He might teach the wizards some unique combat techniques from the ninja world. For example, his Chidori could be adapted into a magic spell in the Fairy Tail universe. Maybe he'd form a team with Natsu and Lucy, and they'd go on adventures together, with Kakashi's strategic mind helping them out in tough battles against dark guilds.
Kakashi would likely stand out at Hogwarts. His ninja attire would be a contrast to the wizard robes. Socially, he might be a bit of an enigma at first. But his calm and collected nature could earn him respect. He could join some of the school clubs or teams, like the Dueling Club, where his combat skills could shine.
Well, it could be about Kakashi finally finding Obito after a long search. Maybe Obito has changed a great deal, and Kakashi has to come to terms with this new version of his old friend. They might have a battle first due to their different paths, but then they start to talk and remember their past together, like their time as teammates in Team Minato.
Well, one possibility could be that Itachi has some hidden motive related to the Uchiha clan's secrets. He might think Kakashi knows something crucial. So, he kidnaps him to interrogate him in a secret location.
One possible plot could be that they have a secret wedding. Since both are quite private people in their own ways. They don't want a big fuss, so they hold a very small ceremony in a secluded part of the forest near the village. Only a few very close friends are invited, like Naruto and Shikamaru. After that, they have to deal with the reactions of the rest of the village when they find out, which could be a mix of surprise and happiness.
Perhaps the story focuses on her relationship with the other ninja in the village. She might be friends with the children of Kakashi's old comrades, and they get into all sorts of adventures together, protecting the village from small - scale threats at first and gradually facing bigger challenges.
One possible plot could be that Kakashi is under a genjutsu. In this fanfiction, an enemy ninja might have cast a powerful genjutsu on Kakashi, making him see Naruto as a threat to the village. So, Kakashi attacks Naruto, but Naruto, being the understanding person he is, tries to break the genjutsu instead of fighting back right away.
Perhaps Sakura was being too overconfident and reckless in a battle situation, which put her teammates at risk. Kakashi, as her sensei, decides to punish her. He could make her practice teamwork exercises alone for a while, where she has to simulate different battle scenarios with puppets or something similar to learn how to better cooperate with others.