The character's perspective changes drastically. They no longer take the magic for granted as they did in their first 'life'. They might be more cautious about using magic, especially if they remember the consequences of misusing it from their past life. They also might look at the Death Eaters not just as villains but as products of a flawed society, and try to reform rather than just defeat them, which is a very different approach compared to the original characters in the Harry Potter series.
The reincarnation makes the character see the wizarding world with fresh eyes. They might notice things that were overlooked in the original story. For example, they could see the flaws in the Hogwarts education system more clearly.
It changes the story by introducing an element of mystery. Since the oc is reincarnated, there are questions about their past life and how it will impact the present in the Harry Potter universe. For instance, they might have a connection to a long - forgotten magical artifact from their past life.
His character might become more family - oriented. Since Arthur was very much a family man, Harry could start to value family bonds more. He might also develop a new - found interest in Muggle artifacts like Arthur had. And he could become more diplomatic in his approach to different situations, as Arthur was known for his level - headedness.
The plot would change a great deal. For one, Harry would be much more powerful physically. So when facing Voldemort, he could use Thor's strength in combat, not just rely on magic. He might be able to take on Death Eaters more easily.
Some fanfictions focus on the reincarnation as a way to fix the mistakes of the original story. The SI (Self - Insert) character, having read the books or seen the movies in their past life, tries to prevent tragedies. For instance, they might try to save characters like Sirius Black or Fred Weasley. They also often bring in modern concepts or ideas from their previous life into the wizarding world, creating interesting cultural clashes and new plotlines.
Sasuke's adaptation would be a long process. He'd start by observing the daily lives of wizards. He'd notice how they use magic for simple tasks like lighting candles or cleaning. In contrast, in his past life, he'd use ninjutsu for such things. He'd have to get used to the fact that he can't just rely on his Sharingan all the time. He might attend classes at Hogwarts and learn about different spells. At the same time, he'd be constantly comparing the magic here to his ninja skills. As time goes on, he'd start to blend in more, using magic in his own unique way that combines his ninja - like thinking.
In certain fanfiction, Harry Potter can be the reincarnation of Hades. Fanfiction authors often take creative liberties and blend different mythologies or concepts. They might be inspired by the idea that Harry has a connection to death (surviving Voldemort's killing curse as a baby) and Hades is the god of the underworld. So, they create a story where Harry is Hades reincarnated, perhaps with hidden powers or a different destiny related to the magical and mythological elements of both the Harry Potter series and Greek mythology.
The reincarnation can completely change the relationships. For example, if Harry is reincarnated, he might not have the same bond with Ron and Hermione. He could form new friendships that were not possible in the original story.
His relationship with Hermione might become more strained. Hermione, being very rule - bound and having a strong sense of right and wrong, might be very wary of Harry's new connection to Morgana. Ron, on the other hand, might be more accepting at first, but then start to worry as Harry shows signs of changing. With Dumbledore, there could be a whole new level of secrecy and trust issues, as Dumbledore tries to guide Harry while also being cautious of his Morgana - influenced powers.
His friends might be initially shocked. Hermione would be super curious and want to research all about it. Ron might be a bit jealous at first, but then come around. Their adventures would be different as Harry would have new insights from the founders.
His perspective could expand. He might start to consider new possibilities within the wizarding world. For example, if a fanfiction introduced a new relationship between a Fantastic Beast and a wizard, he'd think about how that could work in the real wizarding world.