In terms of their magical abilities, different writers can take diverse approaches. One may give Lily Luna a special gift for divination, while her brothers are more skilled in transfiguration and charms respectively. Or perhaps a writer could portray all of them as having an equal aptitude for all types of magic, but they choose to focus on different areas based on their personalities. For instance, if one brother is really into books and knowledge, he might be more drawn to spells that require a lot of study, like ancient runes magic.
Writers may also differ in how they show the characters' relationships with their peers. One writer could have Lily Luna being extremely popular among her classmates, while her brothers are more of the loner types. Another might write that all three of them are part of a tight - knit group of friends, but each has a different role within the group. Lily Luna could be the mediator, one brother the joker, and the other the responsible one.
In some fanfictions, Lily Luna Potter in Slytherin might be portrayed as an outcast within her own family's legacy. Since the Potters are mostly associated with Gryffindor, her being in Slytherin could make her feel like she has to prove herself more. She might be depicted as having a more cunning side, using her Slytherin traits to achieve her goals while still maintaining some of the Potter family's good - heartedness.
Well, some writers might portray Sasuke as more vulnerable in fanfiction than in the original series. They could show him relying on Sakura more for emotional support. For example, after a difficult mission, he might seek Sakura's comfort instead of shutting her out. On the other hand, Sakura could be depicted as even more assertive. Instead of just pining for Sasuke, she could be the one to take the lead in their relationship, making decisions about their future together.
Writers often portray the characters in unique ways in Loveater fanfictions. Marinette, as Ladybug, could be more emotional. The stress of dealing with Loveater might make her more likely to let her feelings for Adrien (Chat Noir) show in ways she normally wouldn't. Chat Noir, on the other hand, could be portrayed as more brooding. He might be more focused on the mystery behind the akuma and less on his usual flirty self.
One popular storyline could be their adventures at Hogwarts. Maybe they discover a hidden chamber together. Another could be how they deal with the legacy of their famous parents. For example, they might face pressure from other students who expect them to be as great as Harry, Ginny, Ron and Hermione. And they could also have their own unique magical abilities that they explore and use to solve various mysteries around the school.
Some writers may portray Twilight Sparkle as more rebellious in fanfiction. Instead of always following Celestia's teachings blindly, she might question and come up with her own solutions. For Princess Celestia, some writers show her with more flaws. Maybe she makes mistakes in judgment. This is different from her often - perfect portrayal in the original series.
Some writers might make Katniss more vulnerable in the 'lemon' fanfictions. In the original story, she is strong and stoic, but here she could show more of her softer side, especially in her relationship with Peeta. For Peeta, he might be portrayed as more assertive in the romantic aspects. Usually, he is the more gentle one, but in these fanfictions, he could take the lead more often.
Writers may also portray their powers in relation to their personalities. Since Kurama is often seen as more aggressive, his powers could be shown as more direct and forceful. Shukaku, being a bit more unpredictable, might have powers that are more erratic. For instance, Kurama's attacks could be like a powerful blast that clears everything in its path, while Shukaku's sand attacks could be more like a creeping, unpredictable force that surrounds and entraps the enemy. Writers could also play with the idea of their powers evolving in different ways. Maybe Kurama discovers a new form of his fire power, and Shukaku learns to use his sand in a more offensive way than just defense.
Writers portray their relationship in various ways. One way is through a magical bond. They might write that there is a special magical connection between Hermione and little Harry that makes them understand each other on a deeper level. Another way is in the context of Hogwarts' politics. Hermione could be protecting Harry from those who might want to use him for their own gain within the school. Their relationship can also be shown as a source of comfort for both of them. Harry, who has a tough life outside Hogwarts, finds solace in Hermione's company, and Hermione, who often feels like an outsider because of her intelligence, feels needed and important when she is with Harry.
Writers often vary in how they portray the relationship. One way is through their communication. In some fanfictions, they have more open and friendly conversations as kids, while in the original story, there are always undertones of mystery. Another difference could be in their physical interactions. For example, some writers might have them hugging more often as young brothers, showing a closer emotional bond. Also, the level of trust can be depicted differently. In some fan works, Sasuke trusts Itachi completely from the start, which is a contrast to the real story where trust is gradually eroded.
Writers often start by showing the build - up of the character's despair. In Harry Potter fanfic, they might describe how a character's grades are slipping, they're isolating themselves from friends, and losing interest in magic. In Supernatural fanfic, it could be a hunter not taking care of their weapons or not showing up for hunts. This shows that something is wrong before the suicidal thoughts are fully revealed.