Naruto would probably be very friendly and kind. He has a big heart, so he'd likely greet her with a big smile and start chatting right away, asking her name and where she's from.
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.
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.
It could lead to completely different character dynamics and storylines. The gender swap might change how Naruto interacts with others and how the plot unfolds.
It could lead to interesting plot twists and character developments. Maybe she'd face different challenges and have a unique dynamic with other characters.
If Naruto becomes a girl, her character development would be quite distinct. She could start to view the world from a more empathetic perspective. Her experiences as a girl could make her more aware of the inequalities in the ninja world, especially those related to gender. This new awareness could fuel her drive to make changes. For instance, she might start campaigns or initiatives to give female ninjas more equal opportunities. She would also have to adapt to a different physicality. As a girl, her body might be different in terms of strength and agility, which would force her to develop new fighting styles and strategies, thus leading to a different kind of character growth.
Another possibility could be Sakura. Although she had feelings for Sasuke for a long time, in a fan - created scenario, things could have taken a different turn and she could end up in a relationship with Naruto and get pregnant. However, this would be quite a departure from the original plot dynamics.
Maybe it could be a new character created specifically for the fanfic. This new girl could be from a traveling group of merchants who Naruto meets during one of his missions. Their encounter could lead to a relationship and ultimately the pregnancy.
She might be more empathetic. Girls are often depicted as more in tune with emotions, so Naruto could be more understanding of others' feelings. Also, she could be more tenacious in a different way. Instead of the brash and head - on approach Naruto usually has, she might use her wits more subtly while still being determined to achieve her goals.
It could be just for the fun of it. Writers often like to play with the established characters and create unique scenarios. In this case, seeing strong Naruto in a girl - like form can lead to humorous situations, like when his friends first see him and their shocked reactions. Also, it can open up new plotlines, such as Naruto having to disguise himself as a girl for a mission and having to navigate the situation while still being his strong self.