In the fanfiction, Female Gaara might be more expressive of her emotions. Instead of bottling up her feelings like male Gaara, she could be more open with Naruto about her fears and hopes. Naruto could be made to be more empathetic. When Female Gaara shares her past traumas, Naruto is not just there to listen but truly empathizes with her, which makes their relationship more complex and interesting.
Female Gaara could have a more nurturing side. Since she is a female, she might be more in tune with the needs of her people in a different way than male Gaara. Naruto could be developed to be more patient. In the story, when dealing with Female Gaara's insecurities, he has to be patient and understanding, which is different from his sometimes impulsive nature in the original.
In some fanfictions, Naruto might be more assertive in his feelings towards Gaara compared to the original anime where their relationship is more about friendship. Gaara may be shown as more vulnerable when it comes to love, as in the anime he is often portrayed as stoic and strong.
In the fanfiction, Evil Naruto might be more cynical and power - hungry. He could have lost his belief in the values of the Hidden Leaf. Gaara, on the other hand, might be more cold - hearted and less likely to show any mercy, as opposed to his more complex and evolving personality in the original series.
In the story, Naruto's past traumas of being an outcast can be paralleled with Female Gaara's own experiences. This could lead to them bonding over their shared pain. As they talk about their pasts, they both grow and develop. Naruto becomes more empathetic towards Female Gaara's situation, and she becomes more open - minded and less isolated because of Naruto's friendship and later, love.
For Hinata, her normally shy and reserved nature could be twisted into a more calculating and cold - hearted one in the dark fanfiction. She might use her byakugan not for protection but for manipulation. Naruto, on the other hand, instead of his usual optimistic self, could become more cynical after facing multiple betrayals, especially if Hinata is involved in some of them.
In the original series, Naruto is mainly focused on becoming Hokage and getting Sasuke back. In the fanfiction, as Anbu Naruto, he might be more secretive and have a darker side. He could be more cynical about the village's politics. Female Sasuke, on the other hand, may be more independent than in the original. She could be more involved in political matters in the village rather than just seeking revenge. For example, she might use her skills to try and reform the ninja system.
Itachi could be developed to have a sense of humor in the fanfiction. He might crack jokes with Sakura during their study sessions or when they are just hanging out. Sakura, on the other hand, could be more mysterious. She might have a hobby or a past experience that she hasn't shared with anyone yet, not even Itachi, which adds an element of intrigue to their relationship.
In fanfiction, Naruto might be portrayed as more emotionally vulnerable around Sasuke. In the original series, he was always very boisterous and positive, but in fanfiction about their brotherly relationship, he could show his insecurities to Sasuke more openly. For example, he might talk about his fear of not being good enough as Hokage. Sasuke, on the other hand, could be shown as more patient. In the original, he was often brooding and impatient, but here he listens attentively to Naruto's concerns.
In some fanfictions, Naruto's childhood self can be even more naive and innocent compared to the original. He might be more openly vulnerable about his feelings of loneliness. For example, he could cry more easily when Sakura accidentally says something that hurts his feelings. Sakura, on the other hand, may be portrayed as more motherly towards Naruto in her childhood in fanfictions. In the original, she was mainly focused on Sasuke, but in fanfiction, she might be the one to comfort Naruto more often.
Naruto could be given a more complex personality in the modern fanfiction. He might be more introverted at first, having to deal with the loss of his father in a modern way (like through memories in a digital photo album). Kushina, on the other hand, could be shown as having a secret past that is slowly revealed through modern - day detective work by Naruto and his friends, which would be a big departure from her straightforward backstory in the original.
Dark Naruto could be developed to have a different set of ninja skills. He might learn some forbidden jutsu on his own in his journey to the dark side, which gives him an edge over others. In terms of Fem Sasuke, she could be more in tune with her feminine side. Instead of just being cold and brooding like the original Sasuke, she could use her charm and intelligence to get what she wants. For instance, when dealing with enemies, she might use her wits to outsmart them rather than always relying on brute force. Also, Dark Naruto could have a more philosophical side, constantly questioning the nature of power and the ninja world, which is different from the more impulsive original Naruto.