In fanfiction, Kallen's backstory could be explored more deeply in relation to Lelouch. For instance, we could see how her family history affects her interactions with Lelouch. Maybe there are family secrets that come to light and influence how she views Lelouch and their shared goals. This would add new layers to her character that were not as fully explored in the original series. Also, Lelouch's relationship with his sister could be intertwined more with his relationship with Kallen in fanfiction, showing a different side of his character development.
In fanfiction, their characters can be developed in various ways. For example, Kallen might be more open about her feelings towards Lelouch earlier than in the original series. Maybe she directly confronts him about her admiration and loyalty, which could lead to different relationship dynamics.
In fanfiction, their relationship can be more romantic. For example, some fanfics have Lelouch and Kallen sharing more intimate moments that were not shown in the original series. It gives the writers a chance to explore their feelings in a deeper way.
A plot could involve Lelouch and Kallen being forced to work with an old enemy in order to stop a greater threat. At first, they are hesitant and distrustful, but as they face difficulties together, they realize that they can use this situation to their advantage. This situation also brings them closer as they share their strategies and secrets.
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.
Sasuke in fanfiction could be developed with more vulnerability. In the original series, he is often seen as stoic and brooding. But in fanfiction set in the ANBU world, he might show his fears and doubts more as he has to deal with the high - stakes and secrecy of ANBU missions. Sakura could be more assertive. In the original, she sometimes seems to be in Sasuke's shadow. Here, she could be an equal or even a leader in ANBU operations. The ANBU environment forces both of them to grow in new ways.
Well, in some fanfictions, Harry's relationship with werewolves could be explored in a much deeper way. He might develop a more empathetic side towards them, especially if he meets a werewolf who is not as bloodthirsty as the ones he has encountered before. Hermione could be developed to be more of a risk - taker. When it comes to werewolves, she might be willing to put herself in more dangerous situations to study them or help them, which is different from her usually cautious self in the original series.
Some characters might develop new skills. For instance, Hermione could learn a type of magic from another universe that makes her even more powerful. This would change her role in the story and how others interact with her.
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.
Uhura's character could be developed to be more assertive in her relationship with Spock. In fanfiction, she might take the lead in certain situations, like when it comes to making decisions about their future together. This is different from the original series where she was more in a supporting role in their relationship.
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.
In fanfiction, Erza might be developed to show more vulnerability. While in the original series she is very strong and stoic, in fanfiction she could be shown to have moments of self - doubt, especially when it comes to her relationships with her guildmates like Lucy. For example, she might worry that her strict nature pushes Lucy away.