If Harry Potter becomes a heartless in fanfiction, the plot would deviate significantly. Firstly, his relationships would be completely disrupted. His friends would be at a loss on how to deal with this new Harry. The Order of the Phoenix would be in chaos as they had counted on Harry as their hope. Secondly, the balance of power in the wizarding world would shift. Since Harry was the one prophesied to defeat Voldemort, with him being heartless, Voldemort could gain more control. And Hogwarts, which was a safe haven, might turn into a place of fear with a heartless Harry ruling or causing trouble there. There would be a lot of moral dilemmas for the other characters as well, like whether to stop Harry by any means necessary or try to rehabilitate him.
The plot would become very dark. Harry would no longer be the hero, so the fight against Voldemort would likely take a different turn. Maybe Voldemort would see Harry as an ally instead of an enemy. The other characters would have to either try to change Harry back or find a new way to defeat Voldemort without Harry's help.
The plot would change drastically. For starters, the whole dynamic of the good vs. evil in the wizarding world would be altered. Harry, being heartless, would not uphold the values of good. His journey would no longer be about fighting for justice and love. He could use his knowledge of magic in a negative way, for example, creating dark spells or potions. This would also affect the way the other characters are portrayed. Hermione might try to use her intelligence to find a way to reverse his condition. Ron would be torn between loyalty to his old friend and the need to protect the wizarding world from this new, dangerous Harry. The story would no longer be a typical hero's journey but rather a story of a fall from grace and the consequences that follow.
The tone would become much darker. Instead of the usual heroic and somewhat light - hearted adventures, there would be a sense of dread and unease. The magic would likely have a more sinister edge to it.
The story would change drastically. The whole dynamic of the wizarding world would be different. Instead of fighting dark wizards with spells, Harry would be dealing with the implications of being a genie. His relationships with other characters would shift as they would now see him as a being with the power to grant wishes.
The story would be completely transformed if Harry Potter becomes a ghost in fanfiction. Firstly, the way he experiences the wizarding world would be novel. He could float around Hogwarts, seeing things from new angles. His relationship with Hermione and Ron would become more complex. They would have to deal with the fact that their friend is no longer fully alive. In terms of the overall plot, the fight against evil could take a different turn. Harry as a ghost could perhaps access areas that were previously off - limits to the living, like certain dark corners of the Forbidden Forest. This could lead to new discoveries about dark magic or ancient secrets. His new form could also attract the attention of other supernatural entities in the wizarding world, leading to new alliances or conflicts that weren't possible when he was alive.
If Harry Potter becomes a Hollow in fanfiction, the entire narrative would be overhauled. The traditional plotlines of him fighting against the dark forces in the wizarding world would be replaced. His friends would no longer be able to rely on him in the same way. For example, his Gryffindor courage might be replaced with a more reckless and dangerous behavior. His magical abilities could be used in unpredictable and harmful ways. The Hogwarts environment would also change as the school tries to deal with the threat that a Hollow - Harry presents. Teachers would have to figure out new ways to protect the students, and the once - safe haven of Hogwarts could become a place filled with fear and uncertainty.
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.
He would become much more aggressive. Harry is usually a calm and strategic fighter, but as the Hulk, he would rely more on brute force and his first instinct would be to attack rather than think through a plan.
He might become more authoritative. Since he has the power of an emperor, he would need to make tough decisions and be more assertive in his commands.
The story would take a very different turn. Harry Potter becoming Gabriel's vessel means that the themes of the story could expand beyond just good vs. evil in the wizarding world. It could introduce elements of the divine and the spiritual. His journey would no longer be just about the wizarding world's politics and power struggles. He might start to attract different kinds of allies and enemies. There could be a whole new set of challenges, like how to balance his wizard identity with his new role as Gabriel's vessel. And his connection to the wizarding world's magic might be altered, perhaps enhanced or even changed in a way that makes him an outlier among wizards.
When Harry Potter becomes a god in fanfiction, his relationships would experience a huge shift. His friends would look at him in a new light. Hermione might see him as a being to learn from, constantly asking him about the deeper secrets of magic. His relationship with the Hogwarts faculty would be more of an equal - to - equal among gods, if we consider them as powerful wizards. And his connection to the wizarding community as a whole would turn into a sort of benevolent guardian - like relationship, where they all look up to him for guidance and protection.
He might become more stealthy and reserved. Instead of being as open as he was in the wizarding world, he'd have to be more secretive as a ninja.