Perhaps it simply means that the concept of Harry Potter is being used as a symbol to defend Hogwarts fanfiction. In the broader Potter community, fanfiction is a big part of the culture. There could be debates about the value or propriety of Hogwarts - related fanfictions, and the idea of Harry Potter (either as a character or the essence of the series) is being invoked to support these fan - created works.
Well, it could be that in the fanfic, Harry Potter uses his magic skills to protect the Queen from dark wizards who are plotting against her. Maybe he creates a powerful protective shield around the palace.
In this fanfiction, perhaps Voldemort is after some powerful magical artifacts stored in Gringotts. Harry, being the hero, steps in. He might have to face various challenges like dark magic traps and dangerous creatures inside the bank while trying to keep it safe. He could also form an alliance with the goblins, who are initially skeptical of him, but then see his determination to protect their precious bank.
In addition to the main ones, there could be some original characters created for this fanfiction. For example, a wizard who is secretly working for the Queen's enemies. There might also be some magical animals that are either helping Harry or causing trouble. And of course, the Queen's advisers and guards would be part of the story as they interact with Harry and the magical world.
Maybe Harry discovers that the goblins are being wrongly accused of something in the wizarding world, like being framed for a theft in Gringotts. So he decides to use his influence and skills to defend them, showing that not all goblins are bad and that they have been misjudged.
It could be a powerful dark wizard who has a grudge against the goblins and wants to destroy Gringotts. This wizard might have been wronged by the goblins in the past, and now he's seeking revenge by trying to bring down the bank. He could be using his own army of dark creatures to attack Gringotts.
It could be some of the pure - blood wizard families who have always looked down on goblins and consider them as inferior beings. They might oppose Harry's attempts to defend the goblin because it goes against their traditional views of the wizard - goblin hierarchy.
In the fanfiction world, Harry might be the heir to Hogwarts if there was some sort of magical pact made generations ago. For example, perhaps one of his ancestors had a special role in the creation or protection of Hogwarts, and this role was passed down through the family. It could also be that his unique magical abilities, like his ability to resist Voldemort's attacks from a young age, are signs of a deeper connection to Hogwarts itself. This connection could be what designates him as the heir in the fanfiction's plot.
One possible reason could be that he was under the influence of a powerful dark magic or a curse that made him lose control. Another reason might be that he was tricked into believing Hogwarts was a threat to the wizarding world in some extreme way. Maybe a powerful enemy manipulated him to think that destroying Hogwarts was the only way to save everyone.
In 'Harry Defends McGonagall' fanfiction, it might show Harry's loyalty and respect for McGonagall. He could defend her against false accusations or unjust treatment. Maybe it's set in a situation where McGonagall is being wrongly blamed for something, and Harry, with his sense of justice, steps up.