Perhaps in the fanfic, Naruto fakes his death to protect his loved ones. He realizes that as long as he's 'alive', his friends and family are in constant danger, so he devises this extreme plan. He then secretly guides and protects them from the shadows.
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.
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.
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.
One possible plot could be that Hermione fakes her death to go undercover and spy on the Death Eaters. She might have discovered a crucial piece of information that can only be obtained by infiltrating their ranks secretly, so she stages her death to avoid suspicion.
Well, perhaps in the fanfiction, Ash fakes his death to escape from some sort of unwanted fame or pressure. He's been in the spotlight for so long, and he just wants a break. So, he devises a plan to make it seem like he's passed away. Then he could start a new life in a different region, maybe with a new identity, and train Pokémon in a more peaceful and private way. He could also use this opportunity to learn more about some rare and elusive Pokémon without the media or his fans constantly following him.
One consequence could be that his friends are devastated at first. They might go through a period of grief and self - blame for not being able to protect him.
It could be a new, powerful ninja who has a vendetta against Naruto. This antagonist might be jealous of Naruto's popularity and power, and wants to take over the Hidden Leaf Village.
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.
A secret organization that has been operating in the shadows and views Naruto as a major threat to their plans. They might be planning something big like taking over the ninja world, and Naruto's presence and influence stand in their way. So, Naruto fakes his death to gather intelligence on this organization without alerting them.
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.