How do Naruto's friends react when he shows them his childhood fanfiction?

First of all, his friends would likely be very curious. Since Naruto has had a rather eventful childhood, the fanfiction could contain a lot of personal elements. They might be amused by his childish handwriting or the simple way he used to express his ideas. Some might even be touched if the fanfiction reveals Naruto's hidden insecurities or hopes from back then. It could also lead to his friends having a new perspective on Naruto, seeing a side of him that they didn't know before.

They could be initially shocked. They might not have expected Harry to leave at all. Some friends could be angry, feeling betrayed that he left without proper explanation.

At first, Naruto might be really confused. He's used to thinking of his friends as his support system, so when they turn on him, he doesn't understand why. He'll probably try to talk to them, to ask what he did wrong. If they don't listen, he could become really sad and withdrawn. Maybe he'll start training even harder, using the pain of being rejected by his friends as motivation to become stronger.

Some of his friends were probably shocked at first. But then they might have become curious.

Shikamaru might just sigh and say something like 'What a troublesome thing to do, Naruto.' But deep down, he would also be a bit curious about why Naruto decided to dye his hair red.

They might be shocked at first. Some friends could become extremely angry towards the abuser. For example, Sasuke, being Naruto's close friend, might vow to protect Naruto more vigilantly and seek revenge on those who have abused him.

There could also be friends who are so loyal to Naruto that they would consider following his request if they truly believe it's for the greater good. However, they would be deeply pained by it. Kakashi, for instance, might understand Naruto's selfless nature but would also struggle with the moral and emotional implications of taking his life.

He would be heartbroken. Naruto values friendship above almost everything. At first, he might not believe it and try to reason with his friends.

Naruto would be extremely hurt. He values his friends above almost everything, so their betrayal would be like a knife to the heart. At first, he'd probably be in disbelief and try to reason with them. When he realizes they won't listen, he might become angry and lash out. But deep down, he'd still hope to win them back.

His friends would be very worried. Annabeth would immediately start looking for solutions. She'd be using her strategic mind to figure out what kind of poison it is and how to get an antidote. Grover would be freaking out a bit but still try to be useful, like using his sense of smell to detect any strange scents around Percy that could give a clue about the poison.