Who could be the main characters in a Harry Potter Gringotts fanfiction?

The goblins are also main characters in many such fanfictions. They have a deep connection to Gringotts and are natural defenders. Their unique magic and understanding of the bank's layout and security make them crucial in any defense. And of course, there could be some descendants of Harry Potter's friends, like a young Gryffindor who feels it's their duty to protect the bank just like Harry protected Hogwarts.

Obviously, Harry Potter would be one of the main characters. And the goblins of Gringotts, like Griphook, would also play a major role as they are the ones doing the protecting.

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.

The goblin elders who oppose Harry's new - found ownership could be the main antagonists. They might be worried about losing their power and influence within Gringotts to a human, especially one as famous as Harry Potter.

The goblins themselves could be the main antagonists. They are in charge of Gringotts and if they are greedy and corrupt, they would oppose any attempts by Harry to expose their wrongdoings that could lead to the bank's bankruptcy. They might try to stop Harry by using their magical skills and the defenses of the bank.

The main character could be a young Gringotts trainee who has always been overlooked but has a hidden talent for magic related to the vaults. Maybe they can sense the magical auras of different vaults and their contents, which is a rare ability. This character gets chosen as the champion unexpectedly and has to rise to the challenges that come their way, learning about their own power and the secrets of Gringotts along the way.

Obviously, Harry Potter would be the main character as it's in the title. But we might also see other familiar faces like Hermione and Ron. They could be helping Harry in his new role as the King of Gringotts. And of course, there would be goblin characters like Griphook who would play important roles as they are closely associated with the bank.

Hermione might also be a main character. Her intelligence and knowledge of magic would be invaluable in dealing with whatever the weapon in Gringotts is. She could be the one to figure out how to unlock the secrets surrounding the weapon, like deciphering ancient runes or understanding complex magical texts related to it.

Goblins are essential characters in Gringotts - related fanfiction. They are the ones who run the bank and have their own set of rules and personalities. Some fanfictions might introduce new goblin characters with unique traits. And then there are the dark wizards or witches who could be trying to break into Gringotts for their own nefarious purposes, like Bellatrix Lestrange who had an interest in the Lestrange vault.

Voldemort or his Death Eaters could be antagonists. They might want to raid Gringotts to get powerful magical artifacts or gold to fund their dark deeds. Another option could be a group of corrupt wizards within the Ministry of Magic who see Gringotts as a source of wealth and power that they can control. They could try to undermine the Head Goblin and Harry Potter if they stand in their way.