The Third Hokage might also come across Naruto in his girl disguise. He could be either amused or concerned depending on the situation. And some of the female villagers might interact with Naruto. They could either be kind and helpful, thinking he's a new girl in the village, or be a bit catty if they sense something off about this new 'girl'.
Well, Hinata would be one of the main characters with a different interaction. She might be more open and confident around Naruto as a girl. Tsunade could also play an important role. She might take Naruto under her wing more as a girl, teaching her things about being a female ninja. And Rock Lee might be even more eager to compete with Naruto as a girl, seeing it as a new and exciting challenge.
One interesting plot could be Naruto disguising as a girl to infiltrate an all - female ninja group. He has to learn how to act like a girl, which includes changing his mannerisms and speech patterns. He might end up making some really close female friends who later find out his true identity and are both shocked and amused.
Another character could be Hinata. She might be more shy around girl Naruto at first but then they could develop a strong friendship. And the Akatsuki members could also have different interactions with girl Naruto. For example, Itachi might see her as a different kind of threat or an interesting enigma, which could lead to some intense confrontations or unexpected alliances.
One common theme is identity. Naruto has to constantly remember who he really is while maintaining the boy - disguise. Another theme is friendship. He forms new relationships while disguised, and these relationships are often tested when his true identity is at risk of being revealed.
Sasuke would probably interact differently. As a girl, Naruto might be more of an enigma to him. He could be more protective or more conflicted in his feelings towards her. Instead of just seeing her as a rival, there could be a romantic undertone in their interactions.
Sasuke is a very common character paired with 'girl Naruto'. Their relationship, which was already complex when Naruto was a boy, becomes even more so in these fanfictions. There's often a lot of tension and unspoken feelings between them. Another common pairing is with Naruto and Kakashi. In some stories, Kakashi becomes a mentor in a different way to 'girl Naruto', guiding her through the new challenges she faces as a female ninja.
Another is the struggle to maintain the disguise. This can involve things like trying to imitate male behavior, speech patterns, and physical mannerisms. In some fanfictions, the character has to constantly be on guard against accidental reveals, like when changing clothes or during physical activities that could expose their true identity.
Sasuke would definitely be one of the main characters to interact with Naruto. Their relationship has always been complex, and with Naruto as a girl, it could become even more so. Sakura would also interact a lot. She might be both jealous and intrigued by Naruto's new form. Kakashi too, as Naruto's mentor, would have to adjust to this change and guide 'her' in a different way perhaps.
Sasuke would be really interesting. His relationship with Naruto was always complex, and if Naruto is a girl, it could add a new level of tension or even a different kind of friendship/rivalry. Sakura too. She might have a whole new perspective on Naruto as a girl, and they could form a stronger bond as female comrades. And Kakashi, his reaction to Naruto's transformation could be quite humorous and also a source of guidance for Naruto in this new situation.
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.