Well, perhaps the Island of Fire is a place where ancient magic is stored. Harry discovers that his family has a connection to this place and he has to unlock the secrets within. The island could also be a prison for dark wizards from long ago, and some of them start to break free, causing chaos for Harry and his companions.
He might have discovered the island during one of his adventures and claimed it as his own. Since there was no one else on the island at the time, and he was the first to set foot on it and recognize its potential, he decided to make it his property.
Perhaps he uses the island as a secret training ground. He could practice advanced spells away from the prying eyes of Hogwarts faculty and students. Harry might also build his own magical fortress on the island for protection and privacy.
There could be some of the house - elves that Harry has freed. They might choose to live on the island, using their magic to help with various tasks such as farming magical plants or taking care of the island's infrastructure. Also, some of the students from Hogwarts who were inspired by Harry could be there. They might be learning new forms of magic that are specific to the island or studying the unique magical ecosystem there.
Ron might be there too. He could use his skills in handling magical creatures to populate the island with friendly ones. And he could also help with fishing in the surrounding waters using magic, providing food for those on the island.
Well, it might be that the Goblet of Fire has been corrupted in the fanfiction. It could be causing chaos in the Triwizard Tournament, endangering the lives of the students more than it should. Harry, being the hero, takes it upon himself to destroy it to restore order. For example, if it starts spawning dangerous and unfair tasks that are clearly not part of the original tournament's design.
I'm not sure specifically as there could be many different takes in such a fanfiction. It might be about Harry Potter discovering or owning an island, perhaps with magical elements on it, like hidden magical creatures or ancient spells.
There could be. 'Harry Potter' has a huge fan base and they like to explore different concepts. Fire elementals could be added to the story in many ways, for example, as a new kind of magical creature or as a power that a character discovers. However, not all fanfictions are easy to find. You might need to search through different platforms dedicated to 'Harry Potter' fan works.
In fanfiction, the possibilities are endless. Harry Potter being a fire mage could be part of a unique take on the story. It could change his role in battles, his relationships with other characters, and the overall plot. For example, as a fire mage, he might have a special connection with certain magical creatures that are associated with fire, or he could develop new spells and techniques related to fire magic that are not in the original books.