One possible plot could be that after losing many friends in a major battle, Naruto becomes disillusioned. He might start to see the world as a cruel place where strength is the only thing that matters. So he shuts off his emotions to avoid further pain, and becomes cold - hearted towards his former allies and enemies alike.
If Naruto becomes cold - hearted, his relationships with the villagers would change drastically. The villagers, who once saw him as a hero, would now be faced with a cold and unapproachable Naruto. Children who used to look up to him would be scared. His friends from the Akatsuki days, like Nagato, might even see this new Naruto as a threat. Overall, his relationships would go from being warm and friendly to cold and distant, filled with suspicion and unease.
Well, it depends on the specific fanfiction. Some fanfic authors might write Naruto as cold - hearted for the sake of creating a unique plot or exploring a darker side of the Naruto universe. However, in the main Naruto series, he is far from cold - hearted. He has a big heart and is always trying to save and protect those around him. So, in most cases in fanfiction, it's an interesting but not - so - true - to - the - original take on his character.
It could be related to some sort of external influence, like a curse or a dark chakra that has infected him. This could be slowly changing his personality from the warm - hearted Naruto we know to a cold - hearted version. For example, if there was a powerful enemy who placed a curse on him that targeted his emotions.
A love interest who breaks his heart multiple times. For example, if this person plays with his feelings, lies to him, or cheats on him, Percy could become cold - hearted as a form of self - protection. He would no longer trust easily and would close his heart to new relationships.
One common theme is the transformation of Naruto's character. His cold - heartedness often stems from some sort of betrayal or past pain, like being ostracized by the village. This changes his once - warm and friendly nature into a cold, more self - centered one.
One possibility is if he faced extreme betrayal in fanfiction. For example, if his friends turned on him for some reason, it could lead him to become cold - hearted as a form of self - protection. Another factor could be if he lost someone very dear to him in a particularly cruel way and then closed off his emotions.
In some fanfics, Naruto might be depicted as cold - hearted, but it goes against his canonical character. The original Naruto is known for his warm - heartedness, determination, and his ability to see the good in people. Fanfic authors may take creative liberties for various reasons like exploring different storylines or character arcs, but it's not a common or true - to - the - source representation of Naruto.
One popular 'naruto cold hearted fanfiction' is 'The Ice Within Naruto'. In this story, Naruto has a cold - hearted streak due to some past traumas. He becomes more aloof and calculating, which is a big change from his canon character. It's interesting to see how his relationships with other characters like Sasuke and Sakura are affected.