Sasuke would be more cynical about it. He might think Naruto is being foolish or overly dramatic. But at the same time, he would be curious about Naruto's motives. And if there are any threats involved that could endanger the village or their friends, Sasuke would reluctantly get involved to help Naruto.
Sakura would be extremely angry at first. She has known Naruto for a long time and would feel betrayed that he didn't trust her enough to tell the truth. But later, she would understand his reasons and might even help him if she could.
Hinata would be heartbroken. She loves Naruto deeply. However, she is also a strong - willed woman. She would start to suspect that something is wrong and might start her own investigation to find out the truth behind Naruto's 'death'. And when she discovers the truth, she would support him no matter what.
One possible reason could be to protect his family. After the war, Naruto might have made many enemies. By faking his death, he could draw the attention of these enemies away from his family, especially his wife and children. His enemies would think he's no longer a threat and stop targeting his loved ones.
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.
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.
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.
Naruto could also be defiant. Given his strong - willed nature, he might not accept the banishment quietly. He may try to prove his innocence or the importance of his presence in the village. He could use his godlike powers to make a statement, not in a harmful way, but to show that banishing him is a mistake. For example, he might perform some great feats to protect the village from an outside threat even while banished, to show that he still cares about it.
Well, he might use some substitution jutsu. He could replace himself with a log or something similar at the crucial moment, making it seem like he's been killed.
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.
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.
Sakura would be devastated. She has known Naruto for a long time and has seen him grow from a loud - mouthed kid to a great ninja. His death would make her question everything. She might become more withdrawn and serious. Hinata would be heartbroken. She had deep feelings for Naruto. She might even lose her will to fight for a while.
Sasuke would likely be conflicted. On one hand, he and Naruto have a deep bond, but on the other, Sasuke has his own ideas about justice. He might try to stop Naruto at first, reasoning with him. If that fails, he could be forced to choose a side, either to support Naruto's cause if he believes there's some merit to it, or oppose him to protect the shinobi world as he knows it.