A really exciting plot could be that there is a prophecy that involves both Harry Potter and the goblins. The goblins have their own ancient prophecies that seem to connect with the ones about Harry. They have to work together to figure out what the prophecies mean and prevent a great disaster from befalling the wizarding world. This would involve a lot of research into old goblin and wizard lore, and they would have to travel to different magical places to find the missing pieces of the puzzle.
Well, perhaps Harry Potter could shock the goblins by revealing some long - hidden magic that they were unaware of. Maybe he discovers a new spell that has a huge impact on their way of life or their understanding of magic.
The plot could involve Harry learning about the goblin culture and realizing they are being mistreated by wizards. He then decides to be their friend and advocate for them. This could lead to a series of adventures where he tries to change the laws and attitudes towards goblins in the wizarding world.
The plot could involve the goblins rescuing Harry when he is being wrongly accused of a crime in the wizarding world. They could believe in his innocence and use their unique skills and knowledge of magic to keep him safe. Maybe they help him prove his innocence later on. They might also have their own motives for helping Harry, like they see him as a key to some sort of change in the relationship between wizards and goblins.
Maybe the goblins in the fanfiction have turned evil and are causing great harm to the wizarding world. Harry, seeing no other option, decides to take matters into his own hands and kill them to protect others.
Well, one possibility could be that the goblins and Harry Potter team up to fight against Voldemort. The goblins, with their knowledge of ancient magic and their skills in handling treasures and magical items, could provide crucial support. Maybe they help Harry find a powerful artifact that can defeat Voldemort once and for all. Another aspect could be that the goblins have their own motives for allying with Harry, like getting more rights in the wizarding world in return for their help.
One interesting plot point could be Harry helping the goblins in a rebellion against the wizarding world's unfair treatment of them. Another could be him learning goblin - made magic that is different from what he learned at Hogwarts. Maybe he discovers a hidden goblin treasure that has a powerful magical item and has to protect it from dark wizards.
One interesting plot could be a goblin rebellion against the wizarding world's control over their banks. They might use their knowledge of magic and hidden tunnels to stage a takeover.
The relationship could start with mutual distrust. Harry has been taught certain things about goblins, and they have their own reservations about wizards. But as they are forced to work together on a task, like protecting a powerful magical artifact from dark wizards, they begin to see each other's strengths. Harry realizes the goblins' knowledge of magic items is invaluable, and the goblins see Harry's courage and loyalty.
One possible plot twist could be that the goblins have their own motives for raising Harry. Maybe they see him as a key to some hidden treasure or power. They could be training him in secret goblin magic that no human wizard knows about.
Well, it might be that Harry discovers a hidden goblin training ground. There, he learns unique magic skills not taught at Hogwarts. Maybe he's taught how to use ancient goblin-made weapons in combat, which gives him an edge in fighting dark wizards.