Iruka - sensei is a character that can show up. Since he was important in Naruto's life, he could play a role in the girl's upbringing too. He might help with her education in the ninja academy. Also, the Akatsuki members could be antagonists in some stories. Their actions might force Naruto to protect the girl more fiercely, and this would drive the plot forward as Naruto battles against them to keep the girl safe.
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.
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.
His friends' reactions would vary. Hinata would be really happy for Naruto. She would be gentle with the little girl and offer to make her clothes or cook for her. Kiba might be a bit skeptical at first, thinking Naruto might not be fully prepared for raising a child. But when he sees how much Naruto cares, he would be more accepting. Choji would probably be excited and share his snacks with the little girl right away, showing his warm - heartedness towards Naruto's new family member.
She could be a young girl who has lost her parents in a magical accident. Maybe she has some special powers that Harry notices and that's why he decides to adopt her.
In the fanfiction, Batman might adopt the little girl because she shows extraordinary intelligence or a unique ability. For example, she could be a tech prodigy. This would attract Batman as he always looks for ways to enhance his crime - fighting capabilities. He would then have to balance his role as a father figure with his duties as Batman, which could lead to some interesting internal and external conflicts.
The girl might be a descendant of an old wizarding family that has fallen on hard times. Harry adopts her to revive the family's honor. She could have some special knowledge or heirloom that attracts Harry's attention and makes him decide to take her in.
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.
The 'ino adopts naruto fanfiction' could center around the idea of family and friendship. Ino, by adopting Naruto, creates a new kind of bond. It could delve into how the village reacts to this new situation. There might be challenges they face together, such as dealing with Naruto's reputation or Ino having to balance her own life and responsibilities with taking care of Naruto. It could also be a story full of heartwarming moments as they build a family - like relationship.
In some fanfictions where Sakura adopts Naruto, it could be about Sakura seeing Naruto's need for a family. Maybe she decides to take him in after realizing how alone he has been. This can lead to a lot of character development for both of them. Naruto might start to heal from his past traumas, and Sakura could grow into a more nurturing figure.