Hinata's dark personality development could involve her becoming power - hungry. She could start to see Naruto as a means to gain more power in the village, rather than as a love interest. Naruto might develop a more brooding personality. He could isolate himself from others, believing that he can't trust anyone, not even Hinata, and focus solely on becoming stronger to protect himself from potential threats.
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 a dark take on the characters, Hinata could be made into a vengeful character. Maybe she blames Naruto for something that happened to her family in the past and is out for revenge. Naruto's personality could be developed in a way that he is constantly on edge. He is always suspecting those around him, including Hinata, and this makes him act more rashly and less like the hero we know. This would completely change the dynamic between them in the fanfiction.
Dark Naruto could be developed by giving him new abilities that are a result of his darkness. This would change his fighting style and how he approaches problems. Karin could be developed by making her more of a strategist. Instead of just being a sensor, she could use her knowledge of the ninja world and her understanding of Naruto to come up with plans. For example, she could figure out ways to help Naruto control his dark side better through certain training regimens.
In the baby Sasuke Naruto fanfiction, if Naruto was raised by a family of scholars, he could develop a more intellectual side early on. He might still be loud and energetic, but also have a love for learning and strategy. Sasuke, on the other hand, if he was part of a big, warm family, could be more outgoing and less cold - hearted. His competitiveness could be more about friendly rivalries rather than a deep - seated need to prove himself.
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.
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.
For Naruto, he could be developed by showing his growth in handling academic responsibilities. In college, he might struggle at first with things like time management and studying for exams. But as the story progresses, he learns to be more disciplined. Hinata, on the other hand, could be developed by showing her becoming more assertive. Maybe she starts to speak up more in class and participate in group projects, which is a big change from her shy self.
Percy could be developed as a more brooding and conflicted character. His powers might be darker and less controlled, which makes him a danger to those around him, including Annabeth. Annabeth, on the other hand, could become more determined and a bit more ruthless in her attempts to save Percy from his dark self.
For Fem Naruto, her character could be developed to be more in touch with her femininity while still maintaining her strong - willed and determined nature. She could use her charm in addition to her combat skills to get what she wants. Shisui, on the other hand, could be developed to be more open about his feelings. In the original, he was rather reserved. In the fanfiction, he could be shown to be more vulnerable, especially around Fem Naruto.
Well, Harry is often depicted as more impulsive. His past experiences with Voldemort have made him quick to act when he senses danger. For example, he might jump into a situation to protect others without thinking twice. Cedric, on the other hand, is more cautious. He thinks things through, like when he approaches the Triwizard tasks. He carefully plans his moves.
Naruto's impulsive side can be tempered by Haku's calm and calculated nature. Haku can teach Naruto to think before acting in certain situations. Hinata, on the other hand, can bring out Naruto's more gentle and protective side. And as for Hinata herself, her loyalty and love for her friends can be emphasized. Haku can be developed to show more of his own desires and dreams apart from his loyalty to Zabuza, which he might discover through his interactions with Naruto and Hinata.
For Hinata, her normally shy and gentle personality could become more determined during pregnancy. She might be more assertive in taking care of herself and her unborn child. For example, she could stand up to the elders in the clan if they try to impose any unfair rules on her pregnancy. Neji, on the other hand, being a more stoic character, could show his softer side. He might start to open up more about his feelings and fears regarding fatherhood, which is a side of him that others rarely see.