For fem Kuroko, her character could be developed with more emphasis on her femininity. She might use her charm or intuition in ways that male Kuroko didn't. For example, she could be more in tune with the emotions of her teammates and use that to boost team morale. Aomine, on the other hand, as a female could be developed with a different kind of competitiveness. Instead of just brute strength, she might use her intelligence and strategic thinking more, like finding ways to outwit opponents through psychological warfare.
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 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.
The way Fem Luke interacts with the Force could also be different. Maybe she has a more intuitive connection to the Force, especially when it comes to aspects like sensing the emotions of others. This could make her a more empathetic Jedi, and it could also change how she uses the Force in combat or in diplomatic situations. For example, she might be able to defuse tense situations by sensing the underlying emotions of the parties involved and using the Force to soothe them.
Popular themes often involve transformation. For instance, fem Kuroko could transform from a shy girl to a more confident player with Aomine's influence. Or Aomine could change from being a bit of a lone wolf to a more team - oriented player because of fem Kuroko. Also, the theme of family can be explored. Maybe they come from different family backgrounds that affect their approach to basketball and life in general.
She could be more in tune with her femininity, using it as a strength rather than a hindrance. For example, she might be more perceptive about emotions, both her own and others', which could help her in diplomatic situations with the gods. Instead of the more straightforward and sometimes brash approach of the original Percy, Fem Percy could be more subtle and strategic.
Well, as humans, Elena could be less of the damsel in distress. She could be more assertive and have her own set of goals that don't revolve around vampires or the supernatural. For Klaus, he could lose his violent tendencies and instead be a more brooding artist type. He might use his creativity to deal with his past traumas.
In fanfiction, Roxas might be developed to have more complex emotions about his existence. For example, he could struggle more with his identity as a Nobody and his connection to Sora in ways not fully explored in the game. Xion, on the other hand, could be given more backstory about her creation. Maybe the fanfiction delves deeper into the experiments that led to her existence.
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.
Well, in fanfiction, their relationship might bring out different aspects of their personalities. Since they are married, Tony could be more protective and less of the joker he was in the original show. Ziva, on the other hand, might be more open about her emotions, especially when it comes to her relationship with Tony. This is different from the original show where she often kept her feelings bottled up. The married state in fanfiction gives them a new environment to grow and change as characters.
One way their characters are developed differently in fanfiction is through their parenting styles. In the original series, since they die early, we don't really see them as parents. But in fanfiction, we can see different approaches. Minato could be the strict yet loving father, teaching Naruto advanced ninjutsu from a young age. Kushina could be the nurturing mother, always making sure Naruto is emotionally okay. Additionally, their characters can be developed in relation to the political situation of the village. They could be involved in secret political maneuvers to protect the village and Naruto's future as a potential great ninja.