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.
Maybe Percy has been through a great betrayal, like his closest friend turned on him for power. So he starts to close off his emotions to avoid being hurt again.
In some fanfiction, Percy might be depicted as cold - hearted, but it's often a departure from his canon character. Fanfic writers may do this for creative or plot - driven reasons. However, the real Percy is known for his loyalty and big heart.
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 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.
One reason could be that the writer wants to create conflict. By making Percy cold - hearted, they can set up situations where he has to overcome this new trait. Maybe it's a way to show how much he's changed due to some extreme event in the fanfiction's plot.
Cold and merciless female protagonist novels usually depicted an independent, powerful, and ruthless female image. She might have powerful martial arts and wisdom, and she disdained to interact with ordinary people. She often adopted a cold and heartless attitude towards the people and things around her. Such female novels often involved love and battle. They were often able to show amazing courage and wisdom in difficult situations and eventually become legends.
The following are some of the common cold and heartless female novels:
"Battle Through the Heavens"-Tian Can Tu Du: It narrates the growth of a youth called Xiao Yan. He possesses unparalleled strength and wisdom, but his personality is cold and ruthless, and he disdains to interact with ordinary people.
<< The Peak of Martial Refinement >>-Momo: It tells the story of the growth of a female martial artist. She has a strong character, pursues strength and perfection, and takes a cold and heartless attitude towards the people and things around her.
3." Lord Snow Eagle "-Outsider: It tells the story of a powerful female warrior's growth. She is independent, confident, powerful, and ruthless. She disdains to interact with ordinary people, but in the end, she shows her human side in order to protect her home and family.
4 " Full Time Expert "-Butterfly Blue: It tells the story of the growth of a game expert. Her personality is cold and ruthless, and she pursues technology and victory. She takes a disdainful and contemptuous attitude towards the people and things around her.
These novels all had unique storylines and characters. The readers could choose the reading experience that suited them according to their preferences.
In fanfic, a tragic backstory that was different from his original one could lead to Naruto being cold - hearted. Maybe if he had been abandoned by the whole village instead of just being shunned by some, he could grow up bitter and cold. Also, if he had to make really tough decisions that cost him a lot, like sacrificing friends for the greater good in the fanfic world, it might harden his heart.