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.
In such a fanfic, a really interesting plot twist could be that Harry fakes his death and as a result, Hogwarts itself undergoes some major changes. The school becomes more secretive and starts to develop new security measures thinking Harry is gone and they need to protect themselves better. Or perhaps Harry fakes his death and it turns out that there was a prophecy that predicted this event all along. This prophecy then leads to new revelations about his true purpose and the future of the wizarding world.
In some versions of such fanfiction, Ash fakes his death as part of a master plan to stop an evil organization from achieving their goals. He stages his death in a way that makes the organization believe they are safe, but in reality, he is working behind the scenes, gathering evidence and allies. His friends initially mourn his loss, but as the story unfolds, they start to suspect that something is not right and eventually figure out his plan.
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.
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.
One possible plot development could be that Naruto fakes his death to outwit a powerful enemy. He might go into hiding, secretly gathering information and allies to strike back at the right moment.
One interesting plot twist could be that the letter is delivered by a completely unexpected character, like a house - elf instead of an owl. This would change the whole dynamic of how Harry receives this important news.
One possible plot could be that Naruto fakes his death to outwit a powerful enemy who has been targeting him directly. By doing so, he can secretly gather information and plan a counter - attack.
One interesting plot could be Naruto faking his death to go undercover and expose a hidden conspiracy within the ninja world. He might change his appearance completely and work his way into the enemy's ranks secretly.
Maybe he fakes his death to protect his loved ones from a powerful enemy. He could be trying to draw out a villain who has been targeting his family and friends.