The fanfiction could develop Harry's leadership side further. He has to lead the workers on the Quidditch farm, so he would become more confident in giving orders and making decisions related to the farm's operations. Also, his love for Quidditch would be expressed in a new way, not just as a player but as someone responsible for all aspects of the Quidditch - related activities on the farm.
Well, it could be about Harry using his knowledge of Quidditch to manage the farm. Maybe he trains magical creatures for Quidditch matches on the farm.
He might meet other Hogwarts students who he doesn't know very well. They could become good friends through their shared love of Quidditch.
His loyalty to Harry could intensify. Knowing that Harry is his owner in this fanfiction, Dobby would likely double down on his efforts to protect Harry. This could lead to him making sacrifices he wouldn't have considered before. He might even put himself in more dangerous situations to ensure Harry's safety.
Managing the bureaucracy within the Ministry is no easy feat. There are likely many long - established traditions and procedures that might be resistant to change. Harry, who might be more used to action - oriented tasks, will have to learn how to deal with the red tape and inefficiency that often comes with a large organization like the Ministry.
Perhaps he uses the island as a secret training ground. He could practice advanced spells away from the prying eyes of Hogwarts faculty and students. Harry might also build his own magical fortress on the island for protection and privacy.
In this fanfiction, Harry's development could be centered around his understanding of family. Growing up with a scorpion, he has a very different concept of what a family is. This could lead to him having a complex relationship with the Weasleys or other surrogate families in the wizarding world. He might be hesitant to accept their love and care at first, but gradually come to realize the value of a real family. Also, his magical development could be more instinctive, like how a scorpion reacts instinctively to threats, Harry might use magic in a more impulsive yet effective way when in danger.
Harry would likely develop a very different personality. He may be more solemn and less prone to the typical teenage angst that the original Harry had. Since he is raised by Death, he might be more in tune with the darker aspects of life and magic from a young age.
There could be some of the house - elves that Harry has freed. They might choose to live on the island, using their magic to help with various tasks such as farming magical plants or taking care of the island's infrastructure. Also, some of the students from Hogwarts who were inspired by Harry could be there. They might be learning new forms of magic that are specific to the island or studying the unique magical ecosystem there.
Hermione could be a major character. She would be really helpful with all her knowledge, maybe helping Harry with the care of the magical creatures and coming up with ways to educate the visitors. Ron might also be there, perhaps handling the more physical tasks around the zoo like building enclosures for the larger creatures.
It could be a younger sibling of one of the main characters in the original series. For example, Ginny's little sister who has big shoes to fill but also a great passion for Quidditch.