He might become withdrawn. Instead of being the energetic and outgoing Naruto we know, he could isolate himself from his friends and the village. This would change the whole dynamic of the relationships in the fanfic.
His ninja skills could be affected. Self - hatred often leads to a lack of confidence. So, Naruto may not be as effective in battles or in using his jutsu. He might make more mistakes or hesitate when he should act quickly. For example, if he's in a fight with a powerful enemy, his self - hatred could make him doubt his abilities and thus lose the fight that he might have won otherwise.
One consequence could be that the fanfirls in the fanfic might get sad or angry at being hated. They might stop supporting Naruto in the fan - created stories.
One consequence could be that it makes his character seem more aloof in the fanfic world. People might see him as unfriendly or unapproachable, which could change the way other characters interact with him.
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.
Naruto's hatred for the world in fanfiction might also lead to a change in his powers. His negative emotions could either make him lose control of his existing powers or lead to the development of new, more dangerous powers that are fueled by his hatred. This would pose a great threat not only to his enemies but also to those he once considered friends.
It could also lead to some division among the Naruto fandom. Those who support Sakura's view might be more critical of fanfiction, while those who love fanfiction might not like Sakura as much because of her stance. For example, in online Naruto communities, there could be debates and arguments about whether Sakura is right to hate fanfiction.
One consequence could be that fans who really respect Kushina's character might be more hesitant to engage with fanfictions. If they know that Kushina, in a sense, wouldn't approve, they might feel guilty or less interested in exploring those fictional works.
One consequence could be that he leaves the village. He might go off on his own to find a new place where he feels accepted and can start anew.
The consequence could be that the fanfiction community might feel less connected to Minato as a character. Since he is a significant part of the Naruto universe, his dislike of fanfiction could make some fans less enthusiastic about including him in their fan - created stories. This might lead to a shift in the focus of fanfiction towards other characters who are more 'welcoming' of fan interpretations.
His relationship with Jiraiya could be affected. Jiraiya has a strong connection with the toads, and if Naruto hates toads, it could create a rift between him and his mentor. This could lead to Naruto losing an important source of guidance and support in the fanfiction.
One possible consequence is that it could lead to a split in their group. If they are part of a team or a community, their animosity could cause others to take sides, creating factions.