It could mean that in some fan - created fictional works, Naruto is depicted in a way that goes against his original character, like making him do things he would never do in the official story. This can be seen as a 'betrayal' of the essence of Naruto as a character.
In fanfiction, sometimes authors take creative liberties that might not align with the core values or traits of Naruto. For example, if they make him turn evil for no good reason in their stories. This 'betrayal' might be due to the author's desire to create a unique or shocking plot, but it can be jarring for fans who love the original Naruto. So, 'naruto betrayed by fanfiction' refers to this kind of deviation from the character we know in the official Naruto universe.
It could imply that in some fan - created stories about Harry (presumably Harry Potter), the character of Harry has been depicted as betraying someone or something. Maybe he betrays his friends' trust, or goes against the values he's supposed to uphold in the fanfiction world.
Well, if Ash and his brother 'betrayed' fanfiction, it might be that they promised to contribute to the fanfiction world in a certain way but didn't follow through. For example, they could have agreed to help promote or write for a particular fanfiction project and then backed out. Another possibility is that they used fanfiction in a way that was considered unethical, like taking credit for someone else's work that was part of the fanfiction realm.
At first, Naruto would be extremely hurt. He has always considered Team 7 as his family, so their betrayal would be a huge blow. He might go into a state of shock and disbelief.
He might be initially shocked and heartbroken. Naruto has always valued his friends and the village's trust, so when that's suddenly taken away, he's in disbelief. He could try to reason with his friends at first, but when they don't listen, he might become angry and determined to prove his innocence on his own.
Naruto could also feel a deep sense of hurt. After all, he has been through a lot with Sakura. In the face of her betrayal, he might start to question his own judgment of people. However, being Naruto, he would not give up easily. He might try to find a way to redeem Sakura or at least make her see the error of her ways. He would draw on his own experiences of being ostracized in the past and use that to try to understand her actions and find a solution.
Naruto might initially be in shock. He's a person who values friendship highly, so being betrayed by Mirajane would be a huge blow. He'd probably first try to talk to her, to understand why she did it.
It could mean that in a fan - created fictional story (fanfic), a character named Amy has committed an act of betrayal. Maybe she has broken someone's trust, or revealed a secret that she wasn't supposed to in the context of that fan - made story.
He could then feel a deep sense of anger. Naruto has a temper, especially when it comes to those he loves. He might vow to find out the reason for the betrayal and make things right, or if it was truly malicious, seek revenge in his own Naruto - like way, which would involve trying to understand the person's motives even while being angry.
He could feel a great sense of anger and sadness. Naruto has a big heart, and being betrayed by someone he considered a friend or ally would be deeply hurtful. He might start to question his own judgment in trusting Mavis. And then, he would likely try to find out the reason behind the betrayal. He's not the type to just let it go. He would pursue the truth, whether it's to get revenge or to clear up any misunderstandings.
Naruto's reaction could be complex. He might be sad and disappointed, but he also has a lot of love in his heart. He could try to forgive his teammates, believing that there must be some misunderstanding. However, if they continue to oppose him, his reaction would turn more towards self - preservation and growth. He would focus on his own development, both as a ninja and as a person. He would use this betrayal as a motivation to become stronger, all while still hoping that one day he can reconcile with Team 7.