The Weasley twins might also get involved. They are known for their love of pranks and inventing new magical items. They could create a special device or a new type of magical makeup that Harry could use to change his appearance. They would probably do it with a sense of humor, but it could still be an effective way for Harry to transform himself, like giving him a false nose that can be changed at will or a set of robes that alters his body shape.
One consequence could be that his relationships change. His friends might not recognize the new 'soul - changed' Harry at first, leading to some initial confusion and distance in their friendships.
In some fanfiction concepts, he might change his soul through powerful magic spells. Maybe he discovers an ancient spell in a hidden book in the Room of Requirement that has the power to transform his very essence, his soul.
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Perhaps he is trying to distance himself from his past self. Naruto has had a tough childhood and has been through a lot. Changing his appearance could be a way for him to start anew, to shed the image of the 'troublemaker' or the 'lonely kid'. He might want to present a new, more confident and respected image to the people around him, both friends and foes.
In some fanfictions, Harry might change his identity to protect his friends. For example, if Voldemort was specifically targeting those close to Harry, he could change his look and name so that his friends would no longer be in danger. He could also change his identity to study dark magic secretly in order to better understand Voldemort's power and find a way to defeat him without putting others at risk.
If Harry Potter changes his name to Wizard in fanfiction, it might symbolize a new beginning or a desire to break away from his past. It could also make for some really interesting plot twists. For example, his friends might not know it's him at first, and there could be a whole mystery around who this 'Wizard' really is. This could add an element of intrigue to the fanfiction.
With his friends, it could initially cause confusion. They are so used to calling him Harry that the new name might be a bit of a shock. But if they understand his reasons, they would likely support him. For example, Hermione might be the first to adapt and help others adjust, using her logical thinking to see the benefits of the name change.
One good small change could be in the character development. For example, Neville could start showing his courage a bit earlier in the fanfiction. This would add an interesting twist as it would make the story deviate slightly from the original in a positive way. It could also change the dynamics within the group of friends at Hogwarts.
One popular fanfiction with this concept might be 'The Evans Potter Chronicles' which delves into how Harry's decision to change his name impacts his relationships within the wizarding world. It shows how his friends react and how it changes the power dynamics. Another could be 'A New Identity: Evans Potter' which focuses more on his internal struggle and the reasons behind wanting the name change, like escaping the Potter legacy's burden.