The plot might involve the goblins approaching Harry Potter for help in protecting their underground kingdoms from a new threat, like a horde of dark creatures. Harry, being the hero he is, agrees to form an alliance. They then train together, combining wizard magic with goblin technology and combat skills. This alliance not only helps in fending off the threat but also makes the wizarding community re - evaluate their relationship with the goblins.
Obviously, Harry Potter would be one of the main characters. And Griphook, the goblin we know from the books, could also be a main character as he has prior interactions with Harry. Another could be a young, rebellious goblin who wants to change the relationship between goblins and wizards and is the driving force behind the alliance.
Well, it could be about a young wizard or witch who is sent to learn from goblins. Maybe they study the unique magic goblins possess, like their skills in handling precious magical items. The plot might involve the main character facing challenges in understanding the goblin way of life and magic, and eventually using what they've learned to solve a big problem at Hogwarts or in the wizarding world.
Maybe the female goblin is an outcast in the goblin community. She decides to seek refuge in Hogwarts. There, she has to deal with the prejudice of some students and teachers who are suspicious of her. But she also makes some true friends among the students, and together they work on a mystery that threatens both the goblin and wizarding worlds, like a dark magic that is spreading.
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.
The goblin might be helping Harry because Harry once did a favor for the goblin's family. In the fanfiction, the goblin could be an expert in ancient magic spells that have been long forgotten. He could teach Harry these spells, which would give Harry an edge in the fight against the forces of evil. For example, a spell that can turn the dark wizard's own magic back on them.
Well, perhaps Harry stumbles upon a goblin in a dangerous situation, like being trapped by dark wizards who want to steal the goblin's magic artifacts. Harry uses his skills and spells to fend off the bad guys and rescue the goblin.
It could be that the Goblin King's magical artifacts are being stolen one by one, and this is weakening his realm. Harry Potter gets wind of this and decides to help. He teams up with some of his Hogwarts friends like Hermione and Ron. They use their combined knowledge of magic and spells to track down the thieves and return the artifacts to the Goblin King, thus saving his kingdom.
Well, perhaps the young goblin is in danger from some dark wizards who want to use its unique magical abilities for evil. Harry Potter, being the hero he is, stumbles upon the situation and uses his skills and magic to fend off the bad guys and save the goblin. Maybe he discovers the goblin has some information crucial to the wizarding world's safety too.
The plot could involve a situation where Harry Potter hires a goblin lawyer to fight against the unfair treatment of house - elves in the wizarding world. He might want to use legal means to change the laws regarding their servitude. Since goblins have their own ideas about fairness and legality, the goblin lawyer could be crucial in formulating a legal strategy for this noble cause.
Maybe the goblin is an outcast in its own community. Harry befriends it, and they discover a conspiracy within the wizarding world and the goblin banks. As they become friends, they use their combined knowledge of magic and goblin lore to expose the conspiracy. Along the way, Harry learns about the complex history and culture of goblins, which changes his perspective on the magical world.