It lightens the mood. Hogwarts is under Umbridge's strict rule, and her presence is oppressive. Harry's pranks bring some humor and a sense of rebellion. Students start to feel a bit more hopeful and are more likely to resist Umbridge's silly rules.
However, it could also cause some division. There might be some students or staff who think that revenge is not the proper way, even against someone as cruel as Umbridge. This could lead to arguments and a split in the Hogwarts community, at least for a while.
One creative prank could be that Harry uses magic to make Umbridge's quills write only nonsense whenever she tries to write a decree. Another could be that he enchants her office so that every time she sits in her chair, it makes a loud and embarrassing noise, like a donkey braying. And he could also charm her teacup to refill with a really bitter-tasting potion instead of tea.
Some fans might be very disappointed as Ginny and Harry had a much - loved relationship in the original books. It could lead to a lot of debate within the community, with some fans strongly against such a plotline and others being more open to exploring different and darker aspects of relationships.
His quitting potions could open up new storylines. He might have more time to explore other areas of magic or get involved in different adventures. For example, he could start an independent study of a unique form of magic that was not possible when he was occupied with potions. This can add more variety to the fanfiction plot.
It can add a new layer of intrigue. Readers will be curious about why he renamed himself and what he hopes to achieve. This can keep them engaged as they try to figure out the motives behind the name change.
It could make it harder for him to study traditional subjects like History of Magic. He might struggle to read long texts and remember facts in the way that the professors expect. However, it could also give him an advantage in more hands - on magical classes like Potions or Defense Against the Dark Arts, where his dyslexia - related creativity could shine through.
It can greatly affect the plot. For instance, if Harry is female, the way Voldemort views her could be different. He might underestimate her in some ways or be more intrigued by her. This could change the sequence of their confrontations. Also, if Hermione is male, his friendship with Ron and Harry could have new tensions. Maybe he'd be more competitive with Harry, which could lead to different sub - plots within the story.
It can make the story more intense. A pissed - off Harry Potter is likely to take more drastic actions. For instance, he might be more aggressive in his fight against the dark forces, which can drive the plot forward quickly.
Well, it can completely change the story arc. Since Harry is a central figure, if he's uncaring, the whole fight against Voldemort could be affected. He may not be as motivated to seek out Horcruxes or train for battles.
The fight against Voldemort would be very different. Since Hogwarts is a key place in the battle against the Dark Lord, if Harry isn't there, the defenses of Hogwarts might not be set up in the same way. Also, he won't be trained by the professors, so his magical skills won't develop as they did in the original story. Without Harry at Hogwarts, the balance of power between good and evil in the wizarding world could shift in a very unexpected way.