Another possible plot is that Kakashi's adoption of Naruto draws the attention of some hidden enemies. These enemies might see Naruto as a threat because of his potential and Kakashi's influence. So they try to target Naruto, which leads to a series of intense battles and adventures where Kakashi has to protect Naruto and help him grow stronger to face these threats.
Kakashi may become more fatherly. He starts to show more emotions and care, different from his usually aloof self in the original series.
Perhaps there could be a plot where Fem Harry Potter is mistaken for a powerful ninja in the Naruto world because of her magical powers that seem like super - strong ninjutsu. Kakashi is initially skeptical but then becomes intrigued. As they interact more, they find out that they have a lot in common in terms of their past traumas and their sense of responsibility, which leads to a deep bond between them.
Perhaps a plotline where Kakashi and Iruka have to protect Naruto from the Akatsuki. They train Naruto intensively to prepare him for any potential attacks. At the same time, they try to keep Naruto's identity as the Jinchuriki of the Nine - Tails a secret from the Akatsuki members who are after his power.
Some fanfictions focus on Kakashi and Naruto's relationship in a more domestic setting. Imagine Naruto living with Kakashi for a while during his training. The fanfic could explore how they handle daily life together, like cooking, cleaning, and dealing with each other's quirks. It gives a more personal and heartwarming view of their relationship.
Well, a common plot is that Yugito, through adopting Naruto, helps him control the Nine - Tails' chakra better. She might use her own experience as a Jinchuriki to guide Naruto. For example, she could take him to a secluded place for special training. Also, there could be a plot where Yugito and Naruto face off against common enemies together. This would not only strengthen their relationship but also show how they complement each other in combat.
Maybe in the fanfiction, Konan adopts Naruto after he is ostracized by the village for some reason. Konan then helps him grow stronger in isolation, and Naruto develops a new understanding of the ninja world outside of Konoha. This could lead to him having a different perspective on his goals and relationships.
Maybe in the fanfiction, Kurenai adopts Naruto and helps him deal with his inner demons. She could use her understanding of the human psyche to guide Naruto through his traumas, like the loneliness he has felt since he was a child.
In some 'naruto adopts girl fanfiction', the girl might be an orphan from a war - torn area. Naruto, having known the pain of being alone as a child, takes her in. He helps her overcome her trauma by sharing his own experiences. For example, he could take her to Ichiraku Ramen and introduce her to his favorite food, creating a bond over simple pleasures. As she grows, she starts to show great potential in ninjutsu, which Naruto nurtures.
One idea could be a crossover with the Harry Potter universe. Kakashi could be a visiting wizard from another dimension, teaching the students at Hogwarts some of his ninja skills. Another could be a crossover with the Avengers. Kakashi's stealth and combat skills would make him a great addition to the team, and it would be interesting to see how he interacts with the likes of Iron Man and Captain America. A third idea might be a crossover with the Lord of the Rings. Kakashi could be a ranger in Middle - earth, using his Sharingan to detect the presence of orcs and other dark forces.
Maybe an OC from a different village who is sent on a mission with Kakashi. Their different backgrounds and skills create an interesting dynamic during the mission. For example, the OC could be a master of water jutsu and Kakashi has to adapt his combat style to work with them.