In some fanfictions, Naruto might forgive his family after realizing the circumstances that led to their actions. For example, if his parents had to make a difficult choice for the greater good, Naruto, with his big - hearted nature, could come to understand and forgive. He might have a heart - to - heart conversation with a family member's spirit or through a time - travel plot where he gets to see the past more clearly.
Perhaps in the fanfiction, Naruto is exposed to a new philosophy or way of thinking that promotes forgiveness. He might meet a wise character who teaches him about the power of forgiving one's family. Also, if Naruto experiences a similar situation where he has to make a tough choice that might be misjudged by others, he could then understand his family better and forgive them. It could also be that Naruto finds out his family had no other option in the situations they were in, and this realization leads to his forgiveness.
Maybe he doesn't like the way his character is often misinterpreted or distorted in fanfiction. Some fanfictions might take his character in directions that he would find unacceptable or disrespectful.
Well, perhaps in this fanfiction, Kushina did something that violated Naruto's principles. Naruto has always been about loyalty and hard work. If Kushina did something like betraying the village or his friends, Naruto, being the stubborn and principled person he is, might not forgive her. Also, it could be that Kushina was absent during some crucial moments in Naruto's life and he holds a grudge for that.
In some fanfiction, Bella might not forgive the Cullens because of a perceived betrayal. For example, if they hid something crucial from her again. It could also be due to them putting her in danger without her consent. Another reason could be a broken promise related to her transformation or her relationship with Edward.
Well, it could be that in the fanfiction, Ron made a mistake that had long - lasting consequences for Harry. Maybe Ron accidentally revealed one of Harry's big secrets that put Harry in danger. So, Harry is unable to forgive Ron as it has changed his life in a negative way.
Well, in the original storyline, Naruto and Sakura are comrades and have a fairly positive relationship overall. So in this fanfiction, the deviation is huge as Naruto doesn't forgive her. In the original, Naruto is very forgiving towards Sakura even when she has her moments of being mean or dismissive of him.
It could also be due to Sakura constantly doubting Naruto's abilities in the story. Naruto has always been looked down upon by many in the original series, and if in the fanfiction Sakura continuously expresses her lack of faith in him, it could lead to his unforgiveness. For example, she might have refused to believe in Naruto's new jutsu or his plans to save the village, which made Naruto feel really disappointed and unable to forgive her.
One possible reason could be that in the fanfiction, his family might have been portrayed as overly strict or controlling. Maybe they forced him into a certain path he didn't want to take, like a particular ninja training regime that Naruto found too rigid.
It would likely be very strained. Naruto would probably avoid Kushina as much as possible. He might not even look at her when they're in the same room.