One interesting aspect could be the exploration of Harry's character from a new perspective. In many 'Harry Potter His Own Side' fanfictions, we might see his internal thoughts and feelings in more depth than in the original books. For example, how he really coped with the pressure of being 'the Chosen One' without always showing it to his friends.
Obviously, Harry Potter is the main character given the title. His character is likely to be the central focus with his 'godlike' abilities and his independent stance.
In this fanfiction, perhaps the concept of Harry being on 'his own side' means he doesn't fully align with the traditional groups in the Harry Potter universe like the Order of the Phoenix or Hogwarts faculty. He could be making his own decisions based on his own moral code, which could lead to some really different storylines. For instance, he might choose to deal with the Death Eaters in a more unorthodox way.
I'm not sure of the specific titles off - hand, but you can start by looking on fanfiction websites like Archive of Our Own or FanFiction.net. Search for 'Harry Potter His Own Side' and then look at the reviews and ratings of the stories. Usually, the ones with high ratings and positive reviews are worth checking out.
Perhaps he barters with magical beings. He could offer his services in solving magical problems for them in exchange for rare building resources. For example, he might help a group of centaurs with a prophecy issue and in return, they give him enchanted wood or special stones. He may also get help from his friends who have access to different resources. Hermione might provide some rare books with building spells, and Ron could get some things from his family's old collection.
In the fanfiction, a key event could be Harry's interaction with the Slytherin students. He might start to adopt their ways of thinking and acting. For example, he could be involved in a plot with some Slytherins to undermine another house in a competition. This shows his ability to work with those who have Slytherin - like ambitions. Also, if he is seen hoarding knowledge or resources for himself, like a Slytherin would, during a difficult time at Hogwarts, such as a time when there are shortages of certain magical items. This would be a strong indication of his Slytherin side.
In fanfiction, Harry Potter might create his own magic through intense study of ancient and forgotten magical texts. He could discover long - lost incantations and then modify them to suit his needs. Also, his unique connection to Voldemort could play a role. By understanding the dark magic within Voldemort and combining it with the positive magic he's learned, he could create a new form of magic that balances both light and dark elements.
In Harry Potter fanfiction, a character being 'his own man' might mean that he has the independence to make his own choices, regardless of the expectations of others. For example, a character might not follow the typical path set by the original story, like a Slytherin who decides to oppose the pure - blood supremacist views of his family.
Harry might first decide on the values of his world. Is it a world that values equality above all? Based on that, he'd then start to create institutions. He could build a magical council that enforces these values. He would also need to think about the inhabitants. Would he populate it with new species or just bring in his old friends? He could use his creativity to design unique magical creatures that are different from those in the original Potter world. And of course, he'd have to establish a system of magic that is distinct yet still related to what he already knows.
It means that Harry Potter's character continues to exist and develop in the world created by fanfiction writers. Fanfiction allows fans to explore different scenarios and storylines for Harry that may not be in the original books or movies.