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.
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.
His best friends Hermione and Ron would be the most likely candidates. Hermione's intelligence and vast knowledge of magic could come up with a complex plan to fake Harry's death. Ron, with his loyalty and bravery, would be there to support and execute the plan. They have been through so much together that they would be willing to take such risks for Harry.
'Him' could be a centaur. In the Harry Potter universe, centaurs are intelligent and powerful beings. Harry might ride a centaur in a situation where he needs to quickly cross the forest and the centaur's speed and knowledge of the terrain would be very useful.
Hermione could have helped. She's very good at spells and research. She might have found a rare spell in the library that allows for a complete appearance change.
Dumbledore, in his mysterious way, could offer some guidance. He might give Harry a riddle or a hint that leads him to his glasses. Also, Luna Lovegood could have some unique insights. She has a different perspective on magic, and she might suggest something completely out - of - the - box, like looking for the glasses in a place where you'd least expect them, like in the Forbidden Forest.
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.
The 'him' could be Draco Malfoy. It would create an interesting dynamic as they are usually rivals. Maybe in a situation where they are forced to work together on a secret mission for the wizarding world, and they end up in close quarters, rubbing against each other accidentally. This could lead to a change in their relationship, from enmity to a more complex understanding.
The 'him' could also be Snape. In a fanfiction, a spell or a magical experiment could go awry and force Harry to touch Snape. Given their complex relationship in the original series, this forced touch could be a catalyst for a lot of emotions. Harry might finally understand some of Snape's motives or Snape might have a moment of vulnerability that changes how he views Harry.
It could be Voldemort in a really strange and dark fanfiction concept. Maybe Voldemort has found a way to magically force Harry to perform this action as a form of humiliation and domination. This would be a very different take on their relationship compared to the original series.
Dumbledore could also play a role. Even if he's not alive in the normal sense, his spirit or some form of his magic could guide Harry. He might have known about the connection between Harry and Excalibur all along and left behind some hints or instructions for Harry to follow.