Well, it could start with the little girl being an orphan from a destroyed village. Naruto, having experienced similar pain, feels a strong connection. He adopts her and as she grows up, she becomes a source of pride for Naruto. She might also have some unique abilities that Naruto helps her develop while also protecting her from those who might want to use her powers for bad.
One possible plot could be that the little girl is a big fan of Naruto. She gets into some trouble with a group of rogue ninjas. Naruto rescues her and decides to adopt her to keep her safe. As time passes, he discovers that she has a special aptitude for a rare form of ninjutsu. Naruto then devotes himself to training her, and they form a really strong bond like a father - daughter relationship. She also helps Naruto in his own missions by using her unique perspective and skills.
Well, perhaps Naruto finds the cat girl alone and injured. He decides to take her in out of his kind heart. She might start to learn ninja skills from Naruto and his friends, and there could be a lot of comical moments as she tries to adapt to the human world while still having her cat - like behaviors.
One possible plot is that the girl is from a non - magical family but has a deep fascination with Harry's story. Harry discovers her and decides to adopt her as she has a natural inclination towards magic. He trains her privately at first, and as she gets better, he reveals her to the wizarding community. Along the way, they face some challenges from those who are against a Muggle - born being trained by Harry, but they overcome them together.
In this fanfiction, the plot might revolve around the little girl having some secrets or a special ability. Bones adopts her not knowing this at first. As they live together, the girl's secrets start to surface. This causes some tension but also draws them closer as they work through it together. Also, Bones' friends might be skeptical about the adoption at first but then come to love the girl.
It's possible that the little girl's presence would soften Batman's tough exterior. He's always been this brooding, dark figure, but having a daughter - like figure in his life could make him more approachable and show a different side of him to the people of Gotham.
Well, one possibility is that Ichigo, with his strong sense of justice, takes Naruto under his wing. He could teach Naruto some of his combat skills from the Bleach universe. Maybe Naruto would learn to use a sword in a new and unique way, combining it with his own ninja techniques.
One possible plot could be that Naruto discovers an orphaned child during one of his missions. The child has unique chakra abilities but is shunned by the village. Naruto, remembering his own childhood of being an outcast, decides to adopt the boy. He then trains the boy not only in ninja skills but also in values like friendship and perseverance.
In a 'Madara Adopts Naruto' fanfiction, perhaps Madara adopts Naruto because he sees a kindred spirit in him. Madara might want to mold Naruto into a powerful force to reshape the ninja world according to his own ideals. Naruto, on the other hand, could either resist or be influenced by Madara's views, leading to an internal struggle within Naruto as he tries to balance his own values with what Madara is teaching him.
Well, perhaps Naruto finds Scootaloo in a difficult situation, like she's lost or alone. Naruto, being the kind - hearted hero he is, decides to take her under his wing. He might teach her some of his ninja skills, like how to move quietly or be more perceptive. And Scootaloo could learn a lot from Naruto's never - give - up attitude.
In this fanfiction, perhaps Erza is found by Naruto when she's injured. Naruto takes her back to Konoha. Since he has a big heart, he wants to give her a home. As she recovers, they start to bond. Erza might be amazed by the chakra system and Naruto could be intrigued by her magic. They could then go on adventures together, with Naruto protecting her like a father figure at first, and later they become equal partners.
Well, it could be that Arceus, being a powerful and god - like Pokémon, sees Naruto's potential and decides to take him under his wing. Maybe Arceus helps Naruto gain new powers related to Pokémon abilities. For example, Naruto could learn to use Pokémon moves in his battles against the Akatsuki or other enemies in the Naruto world.