In the fanfiction, characters may have different relationships due to the 'across the universe' aspect. Harry could form an alliance with a character from another magical universe who has a completely different view on magic and life. This would force Harry to grow and adapt in new ways, changing his personality over time as he is exposed to new ideas. The character development would be more complex as they are not just dealing with the familiar threats of the original Harry Potter world, but also with the unknowns of other universes.
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.
The characters in this fanfiction may face moral dilemmas that are different from the original series. For example, a character from another universe might introduce a new concept of right and wrong regarding magic use. This would cause characters like Ron to question his own beliefs and values. As a result, they would develop in ways that deviate from their original character arcs, becoming more open - minded or more conflicted depending on how they handle these new situations.
In the fanfiction, Snape might be developed with more of a sense of humor. For example, in the original series, he is very dour, but in the fanfiction, his interactions with Harry in the context of a risky business situation could bring out a side of him that cracks jokes or uses sarcasm in a more light - hearted way. This would be a big departure from his usually serious self in the books.
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.
Often, fanfic authors give Cho a more complex backstory. Maybe she has family secrets related to the wizarding world's history. This can lead to her making different choices. For instance, she could be more involved in the Order of Phoenix's activities earlier on, rather than just being on the sidelines as in the original. This new backstory can also affect her relationships with other characters, like her friendship with Hermione or her rivalry with Ginny in a more nuanced way.
Well, in fanfiction, Severus' character can be developed to show his softer side towards Lily earlier on. In the books, we mainly see his tough exterior and his actions as a double agent. But in fanfiction, we might see him expressing his love for Lily in more open and desperate ways. As for Lily, she could be developed in a way that she is more empathetic towards Severus' situation. In the books, she seemed to cut him off quite harshly, but in fanfiction, she might try to understand his reasons for getting involved with the Death Eaters and still hold some hope for their relationship.
In fanfiction, Harry might be more worldly. Since he gets more exposure to Viktor and Durmstrang, he could pick up on different magical traditions faster. For example, he might start using some Bulgarian hexes in his duels. Viktor, on the other hand, could be shown to be more open - minded. In the books, he was a bit reserved. In fanfiction, he could be more eager to learn about Hogwarts' ways and make more friends there.
The Death Eaters would also have different character development. They might initially be suspicious of Harry, but as he proves his loyalty to Voldemort, they could start to accept him. Some might even see him as a potential leader in the future. Harry's development might also include changes in his magical abilities. Since he's learning from Voldemort, he could gain new and dark forms of magic. This would change his perception of himself and how others see him. His appearance might even change, becoming more gaunt or having a darker aura, which is a physical manifestation of his internal change.
She could be more introverted compared to Harry. While Harry is often thrust into the spotlight, the little sister could be someone who prefers to stay in the background, observing and learning. This would make her a bit of an enigma to the other characters at Hogwarts, and her actions might be more calculated and less impulsive.
In fanfiction, their characters might be given more in - depth backstories. For example, we could learn more about their family life outside of Hogwarts. Maybe Parvati has a special relationship with an elderly relative who is a powerful witch, which wasn't mentioned in the books.
Abraxas Malfoy could be developed to have a more sympathetic backstory. For example, he was pressured into certain actions by his family but secretly wanted a different path. Harry Potter could be developed in a way that shows his growth in understanding the gray areas of the wizarding world. By interacting with the idea of Abraxas Malfoy, he realizes that not all pure - bloods were simply evil. He could learn from Abraxas' story and use it to change his views on some of the long - standing prejudices in the wizarding community.
A female Harry Potter's character could be developed in a way that she challenges Lucius Malfoy's traditional pure - blood beliefs in a more diplomatic way. Instead of just fighting against him, she tries to understand his point of view and then show him the flaws in it. Lucius, on the other hand, could be developed to have a redemption arc that is triggered by his interactions with this different version of Harry Potter. He might start to question his loyalty to Voldemort and his own prejudices.