Harry Potter would become more empathetic. Usually, he is focused on the wizarding world's problems, but saving a goblin child would open his eyes to the plights of other magical beings. This experience could make him more diplomatic as he has to deal with goblin politics and customs to ensure the child's safety. For example, he might have to negotiate with goblin leaders, which would require a new set of skills for him.
Harry's sense of justice would be further emphasized. Saving the goblin child shows that he doesn't discriminate based on species. His confidence would also grow as he overcomes the challenges in saving the child. He would become more respected among the goblin community too.
The goblin could start off as a mysterious figure. For instance, he could first appear to Harry in a dream, giving him cryptic messages. As the story progresses, we learn that he has his own motives, like seeking revenge on a wizard who wronged him in the past. His character could develop from being a bit of an enigma to a fully - fleshed - out ally with a complex backstory.
Well, maybe the goblin child is in danger because of some dark wizards who want to use the goblin's skills for evil. Harry Potter stumbles upon this situation and decides to protect the child. He could use his magic skills like the Patronus charm to fend off the dark wizards and then find a safe place for the goblin child, perhaps among the friendly goblins in Gringotts.
Sanguini's character development could be centered around his transformation from an outsider figure to a respected teacher. At first, the other professors might be skeptical of him teaching DADA. But as he proves his worth through his unique teaching methods and knowledge, he gains their respect. He could also form special bonds with some students who are interested in the darker aspects of magic. He would teach them not only how to defend against dark forces but also how to understand and co - exist with them in a way, which is a very different approach compared to traditional DADA teachings.
The relationship could develop through shared adventures. For example, they might go on a quest together to retrieve a powerful magical item that has significance for both wizards and goblins. This would force them to rely on each other and understand each other's strengths and weaknesses.
Fleur could be shown as more independent and brave. Since she's taking it upon herself to save Harry, it shows her courage. Maybe she becomes more confident in her own abilities outside of the Triwizard Tournament context.
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 would completely shatter the positive perception of Harry. He is known for his kindness and ability to forgive. Such an act would make him seem like a cold - blooded killer, which is the opposite of how he is in the original series.
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.
A group of dark creatures like Dementors could be the antagonists. They might be after the young goblin because goblins have a unique life force that can sustain Dementors in a way other prey cannot. Harry Potter would have to face his own fears while using powerful Patronus magic to drive the Dementors away and save the goblin.
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.