When crossed over with 'Lord of the Rings', as a teacher Harry might have to deal with Hobbits or Elves at Hogwarts. His teaching methods would have to adapt to these new students. He could also teach them magic, which might change the power dynamics in Middle - earth when these characters return, greatly altering the original plot.
In a crossover with 'Alice in Wonderland', Harry as a teacher could bring Wonderland characters into the world of Hogwarts. This would completely disrupt the normal order of Hogwarts. For example, the Cheshire Cat's ability to disappear and reappear could inspire new spells or ways of teaching at Hogwarts, thus changing the plot significantly.
If Harry is a teacher in a crossover with 'Percy Jackson', he might introduce different ways of using magic that could influence the demigods. This would change the way they approach their quests and battles, as they now have new magical knowledge from Harry.
The fanfiction might change the plot in terms of Harry's relationships. Maybe his new ability with the Nuibari makes some of his friends jealous or in awe of him. Also, it could attract the attention of new characters or factions who are interested in the Nuibari. This could create new alliances or rivalries for Harry. For example, some dark wizards might want to steal the Nuibari from him, leading to new conflicts. And in his journey to master the Nuibari, he might have to visit new places or seek help from unexpected sources, thus diverging from the original plot.
It can change the story by adding new plot elements. For instance, her love for superheroes could lead her to search for magical items that can give her superhero - like powers within the wizarding world.
It adds a new type of creature. The werepire concept changes the magical world by introducing a different kind of threat or ally. Harry might have to face different challenges related to this new entity.
It can mislead those who haven't read the original books. If someone reads only this fanfiction, they might get a wrong idea about Harry Potter being arrogant when he's not.
In a fanfiction where Harry uses chakra, the entire magical education system in Hogwarts could be revolutionized. Instead of just focusing on wand - based magic, the curriculum could start to include chakra studies. This would change the way students learn and interact. Harry, being the pioneer of this new form of magic, could become a bit of an outcast or a hero among his peers. His exploration of chakra could also lead him to discover new secrets about the founders of Hogwarts and the origin of magic in the wizarding world, which would completely change the direction of the original plot as he uncovers things that were previously unknown.
Harry having ice powers would make the story quite different. In the wizarding world, most magic is more general in nature. Having ice powers would be a very unique and specialized form of magic. He could potentially use his ice powers to explore areas that are normally too dangerous due to extreme heat or fire - based magic. For instance, he could freeze the dragon in the Triwizard Tournament long enough to get the golden egg. His ice powers could also be a key factor in his relationship with Hermione and Ron. Hermione would be eager to research about this new type of magic, while Ron might be both amazed and a little jealous at first. This would add a new layer of complexity to their friendship.
Well, it would completely disrupt the original dynamic. Harry's relationship with his friends and the wizarding world was centered around his own journey. If he was abandoned for his brother, his brother might become the 'chosen one' figure in this new scenario. This would mean that Harry might grow up feeling resentful or neglected, and his magical abilities could develop in a very different way, perhaps in secret. It could also lead to a different set of alliances and enmities within the wizarding world.
Well, it changes a lot. Firstly, Harry's identity would make him stand out even more. Instead of just being the boy who lived, he's now the son of a major Hindu deity. This could mean that he has different kinds of magic at his disposal. For example, he might be able to use some form of divine protection magic that is unique to Shiva's lineage.
An artificer can change the plot by creating a powerful magical object. For example, if they make a device that can nullify the Unforgivable Curses, it could change the power dynamics between the good and bad wizards. The Death Eaters would be desperate to get it to continue their evil deeds, while the Order of the Phoenix would fight to keep it safe.
His relationships with the other characters are also altered. Dumbledore, for example, had a big role in Harry's life in the original story. But if Harry is Grindelwald's son, Dumbledore's attitude towards him might be more complex. Dumbledore had a history with Grindelwald, and this new connection could make Dumbledore both more protective and more wary of Harry. The same goes for other characters like Snape. Their interactions with Harry would be colored by this new family connection.