The Death Eaters might think they've won at first. There could be chaos and fear among the good wizards. But it could also lead to a secret resistance growing stronger.
One possibility is that Harry uses some advanced and little - known magic. He could have found a spell in an ancient book in the Room of Requirement. This spell might allow him to project an image of his death while he actually hides himself in a magically protected space. He may also have made arrangements with the Order of the Phoenix to spread the news of his death convincingly.
For Ron and Hermione, they would likely be devastated at first, thinking they had lost their best friend. But then they might start to suspect something when they notice small details that don't add up. Ginny would be heartbroken and might become more determined to fight against Voldemort in revenge. The Order of the Phoenix would be in chaos, with some members losing hope while others might start to investigate the circumstances of his 'death' more closely.
One possible scenario could be that Harry uses Polyjuice Potion to create a false body that appears to be his dead self. He might do this to deceive Voldemort and his Death Eaters, giving him the element of surprise to strike back later. Another scenario could involve elaborate magical illusions created with the help of his friends, like Hermione's extensive knowledge of spells and Ron's courage in the face of danger. They could set up a staged death scene that looks very real to the outside world.
Well, Naruto could have made a deal with some powerful being or used some sort of forbidden technique. Maybe he found a way to transfer his life signs to another object or being, making it seem like he was dead. He's always been resourceful and full of surprises, so faking his own death in a really elaborate and unexpected way is not out of the question.
His friends might feel betrayed. They would be mourning his death while he was actually alive. This could lead to a lot of anger and mistrust when they find out the truth.
Maybe he used some rare magical artifacts. In the wizarding world, there are many mysterious items. He could have found an artifact that allows him to project an image of his death while he actually hides in a magically protected place. It's also possible that he faked his death by making a deal with some magical creatures that are good at deception, like the house - elves. They could have used their magic to make everyone believe he was dead.
One possible plotline could be that Naruto fakes his death to protect the village from a powerful enemy who has a vendetta against him specifically. He might do this to draw the enemy out and expose their weaknesses.
In a lot of these fanfictions, Luna Lovegood can be a key character. She has an open - minded and unique way of looking at things. So she might be the one who first suspects that Harry isn't really dead, or she could be part of the plan to help Harry fake his death and then communicate with him in some secret way while everyone else thinks he's gone.
Well, it could be that Harry fakes his death and then assumes a completely new identity. He could be living among the very people he was fighting against, gathering information. And the twist is that he starts to have doubts about the side he was on all along, as he gets to know his enemies better from the inside.