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.
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.
His relationships with his friends would become more complex. They might be sad at first that he's a ghost, but also be comforted by his continued presence. For example, Hermione would probably still try to have intellectual discussions with him, even if he's in a different form.
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 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 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.
In such a fanfiction, Harry Potter as a ghost might have a very different perspective on the wizarding world. He could be able to pass through walls and observe things secretly. Maybe he would try to influence the living wizards in some mysterious ways, like guiding his friends to discover hidden secrets or solve mysteries that were left unsolved when he was alive.
His story would change drastically. He'd no longer rely solely on magic spells. Instead, he'd use the Force. His training would shift from Hogwarts classes to Jedi training with a master. His adventures would likely take him to different planets as well as the magical world. His relationship with Dumbledore might change as he now has a new set of mentors in the Jedi Order.
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.