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.
One possible trait could be her being more nurturing. In the fanfiction, Naruto as a girl might show more care towards her friends and comrades. For example, she could be the one to patch up their wounds more often or offer more emotional support. Another trait could be her being more perceptive. Girls are sometimes seen as more observant, and Naruto could use this to her advantage in battles or in understanding the political situations in the village. And she might also be more creative in her ninja techniques, thinking outside the box more often.
Well, if Naruto was always a girl in the fanfiction, it could change the relationships a great deal. For example, the way Sasuke interacts with Naruto might have a different undertone, perhaps more of a protective or competitive nature in a different way than in the original. Also, Naruto's interactions with other male characters like Kakashi could be altered. Kakashi might be more lenient or have different expectations.
One possible theme could be friendship. Even though it's about a girl being a fan of Kuroko Tetsuya, she might make friends with other fans through their shared love for him.
His kindness will surely be highlighted. Naruto has always been someone who can't stand seeing others in trouble, especially a helpless little girl. His selflessness will also show as he risks his own safety to save her. He doesn't think about the rewards or recognition but just does what he believes is right.
Manga is very diverse. It's not limited to having only girl characters. There are various character types and genders depending on the story and genre.
Given Yugito's connection to the Two - Tails, the baby girl might be quite independent. She'd be used to relying on herself and her own instincts, just as Yugito had to when dealing with the power of the tailed beast. And she'd be very perceptive, able to sense things that others might miss.
She could be brave. Maybe she's not afraid to stand up to bullies in her school or town within the fanfiction world.
Well, it could be about a girl who is always a big fan of Kuroko Tetsuya. Maybe it focuses on her different experiences related to her admiration for him, like how she follows his games, collects his merchandise, or even tries to be like him in some ways.
She might be an extrovert and loves to share her life. It's her way of expressing herself and getting to know others better.
Another plotline might be a friendship - building story. They come from different universes, so they could start by being curious about each other. For example, Wonder Girl could be fascinated by Naruto's ability to use chakra, and Naruto could be in awe of her superhuman abilities. As they spend time together, they become good friends and learn from each other.
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.