Well, the fanfiction could start with Harry having a strange encounter with some magic that makes him question his very identity. As a result, he chooses the name Zuko. With this new name, he could be drawn into a parallel dimension where the rules of magic are different. In this dimension, he has to use the lessons he learned as Harry Potter, but also adapt to the new identity of Zuko. He might meet characters who mistake him for someone from their world because of the name Zuko. This could lead to all sorts of adventures, like helping a group of wizards in this dimension fight against a dark force using his combined knowledge of both his old and new identities.
Hermione would probably be very confused at first. She'd try to understand the reasoning behind it and might be worried that Harry has lost his sense of self. Ron would likely make jokes about it, but also be a bit concerned. Dumbledore, on the other hand, would probably see it as another step in Harry's journey of self - discovery and would encourage him to explore what this new identity means. Voldemort might see it as a sign of weakness or a strange ploy by Harry, but would still be cautious as he doesn't fully understand the implications of this new name.
It would be really interesting. Zuko has a complex personality. He could teach Harry about perseverance and facing one's inner demons. Harry might learn some unique fighting skills from Zuko's Fire Nation training. Also, Zuko's experience with redemption could influence Harry in dealing with the dark side of the wizarding world.
Well, in such a fanfiction, Harry would face a lot of challenges. Since he's raising himself, he might not have the same moral compass as in the original story. He could be more distrustful of others. However, he would also be extremely strong - willed. He might end up creating his own little haven where he practices magic secretly and starts to build his own kind of 'family' of magical creatures or outcasts that he meets along the way.
In some fanfictions, if Harry Potter sacrifices himself, it could lead to a dark and desolate wizarding world. His friends would be left to pick up the pieces, mourning his loss deeply. For example, Hermione might be driven to find a way to reverse his sacrifice through her vast knowledge, while Ron would be filled with a sense of vengeance towards the forces that led to Harry's death.
Well, perhaps the plot could involve Harry having to fend for himself from a very young age in the wizarding world. He might have to figure out magic on his own, without much guidance from adults. Maybe he starts exploring the secrets of Hogwarts by himself earlier than in the original story, leading to all sorts of unexpected adventures.
One possible plot could be that Harry, after years of feeling unappreciated or burdened by his fame in the wizarding world, decides to disown himself. He might leave Hogwarts and the wizarding community behind, perhaps to live as a Muggle. He could change his identity and start a new life, away from the constant danger and expectations that come with being Harry Potter.
It could show Harry relying on his own inner strength and knowledge. Maybe he discovers a new spell through his own research in the library at Hogwarts, a spell that helps him fend off a powerful dark wizard without the help of his friends. For example, he might find a spell that can create a shield of pure energy that not only blocks dark curses but also reflects them back at the attacker.
He might choose to obliviate himself because of guilt. For example, if he made a big mistake during a fight that led to the injury or death of an innocent, he couldn't live with the memory. So, obliviating himself would be a way to escape that emotional pain.
In this type of fanfiction, one possible plot could be that Harry is under extreme mental pressure. Maybe he's constantly haunted by the deaths he has witnessed, like Cedric's death or the losses in the war. The pressure builds to a point where he feels like there's no way out and contemplates shooting himself as a way to end his pain.
One possible plot could be that after the death of Dumbledore and with the Order of the Phoenix in disarray, Harry decides to go into hiding alone. He uses his skills in magic, like the Patronus charm for protection and the Invisibility Cloak to avoid detection. He might start to forage for his own food in the Forbidden Forest, using magic to find edible plants and hunt small magical creatures in a humane way. He also spends his time studying advanced magic on his own to become stronger, preparing for the final battle against Voldemort.