If Naruto is full of hatred in a fanfic, his friends would be in a difficult situation. They could be in danger if Naruto's hatred leads him to make bad decisions. His friends would likely feel a sense of loss, as the Naruto they knew has changed. They may also have to make tough choices, like whether to try to stop him if he goes too far, or to support him in hopes of bringing back the old Naruto.
His friends would be worried and try to reach out to him. They might face rejection as Naruto, consumed by hatred, could push them away. For example, Sakura might try to talk some sense into him but be met with anger.
For Naruto's friends, his transformation due to hatred would be a huge shock. Shikamaru, being the intelligent one, would probably try to come up with a plan to bring Naruto back to his senses. Choji might be heartbroken seeing his friend like this. And for those like Hinata, who have deep feelings for Naruto, it would be especially painful. They would have to deal with Naruto's new, unpredictable behavior, which could include lashing out at them or putting them in harm's way as he pursues his vengeful goals.
Well, if Naruto is consumed by hatred in a fanfic, he may start to use his powers in a more aggressive and less controlled way. He might isolate himself from his friends, like Sasuke did in the original series when he was on his path of revenge. His appearance could even change to reflect his inner turmoil, with a darker look in his eyes and a more menacing stance.
She could start by listening. Just being there to let Naruto vent out all the reasons for his hatred. Then, she might share her own wisdom. If she has some sort of special power or knowledge, she could use it to show Naruto that there's more to life than his hatred. For instance, if she can show him different futures or possibilities that don't involve him being consumed by hatred, it could be a start.
Maybe in the fanfic, Naruto discovers that his parents' death was not as straightforward as he thought. If he finds out that some powerful individuals in the village were actually involved in a conspiracy that led to their deaths, this revelation could be the trigger for his descent into hatred. He might then turn against the village and its leadership, using his powerful jutsu not for protection but for vengeance.
The first consequence could be a breakdown in the village's unity. Naruto is seen as a hero in Konoha, and if he turns against it, many of his supporters might be confused or even follow his lead. This could lead to internal strife within the village.
In Naruto fanfiction, the 'Power of Hatred' can often lead to characters making extreme decisions. For example, they might abandon their previous moral compasses. This power can fuel dark and powerful jutsus, as seen in some fanfics where characters like Sasuke are further influenced by hatred, causing him to be more ruthless in battle and his pursuit of power.
One possibility is that Naruto, filled with hatred, forms an unexpected bond with the female Kyuubi. Maybe the story could explore how they deal with Naruto's inner demons together. The fem Kyuubi might offer a different perspective on Naruto's struggle and help him find a way to overcome his hatred.
One possible reason could be that he feels neglected. Maybe his family was always too busy with other things and didn't give him enough attention. This lack of attention during his formative years could have led to feelings of resentment.
One possible reason could be a misunderstanding. Maybe some false information was spread within the fanfic about the Uzumaki clan that made Naruto believe they were bad. For example, if there were lies about his family's past actions that he wrongly thought were true.
It could be that the fanfic portrays Hinata as being arrogant towards Naruto's past. Naruto has had a difficult childhood and if Hinata in the fanfic mocks or belittles that, it would make Naruto hate her. For instance, if she scoffs at his time as an outcast in the village and uses it as a means to elevate herself, Naruto would surely despise her for it.
One consequence could be that Naruto leaves the village. He might go on a journey alone, seeking a new purpose away from the place that has caused him so much pain. This would be a major change from his original story where he was so attached to the village.