Perhaps he was near a Dementor. Dementors are known for sucking out the happiness and warmth from their surroundings. If Harry was in close proximity to one, it would make him feel extremely cold. This is similar to what happened in the books and movies when Dementors were around.
It could be due to a spell. There are many dark spells in the wizarding world that might cause a person to feel cold. For example, some curses can drain the warmth from a body. If Harry was targeted by such a spell, he would be cold. Also, it might be related to his emotional state. If he was feeling lonely or scared, it could make him feel cold inside, just like when people are in a bad mood in real life, they might feel colder than usual.
One idea could be a crossover where Captain Cold somehow ends up in the wizarding world. Maybe he's on the run from the Flash and uses a magical artifact in Central City that zaps him into Hogwarts. He could initially be seen as a threat but then team up with Harry Potter to fight a common enemy, like a dark wizard who has acquired some sort of technology -mixing magic and science in a dangerous way.
I don't think so. Harry Potter is known for his courage, loyalty and compassion in the official story. While fanfiction can explore different interpretations, making him cold - hearted goes against the essence of the character that most fans are familiar with. So it's not likely to be a common theme in fanfiction.
It could also be about a new character in a fan - created story within the Potter world. This character might possess a power related to cold fury, like being able to freeze things when enraged. And the fanfiction could explore how this power affects the character's relationships with others in Hogwarts or the wizarding world at large.
One reason could be that Harry wants to preserve the integrity of his real story. Fanfiction often takes the original story in different and sometimes wild directions. He might worry that it could distort the truth about his adventures, his friends, and the sacrifices made. For example, some fanfictions might create romantic relationships that didn't exist or change the motives of characters, which could mislead those who are new to the real story of Hogwarts and his battles against Voldemort.
[Douluo: My Martial Soul is the Angel of Justice], by Sword of Azeroth. League of Legends player Cheng Lu crossed the Douluo Continent and was adopted by Golden Crocodile Douluo. He awakened the Angel of Justice Martial Soul and there was a troublemaker boy in the Martial Soul Hall. There were many stories about him on the Douluo Continent, including the reincarnated Great Divine King Tang. The female leads were Tian Yue, Gu Ningqiu, Shui Bing-Er, Xuewu, Dugu Yan, etc., each with their own characteristics. Harry Potter: The Archmage, written by little Harry. George had been reborn in the 1980s and wanted to become a powerful character. However, his initial education was the history of the development of the magic world. This book was different from Harry Potter. It had an original plot and the main character had thoughts. Although there were mixed reviews, a bit of a bad ending, and some delays, it was worth watching overall. The main character had three views, and it was a masterpiece of Harry Potter. Living at Hogwarts, created by precise calculations. The story of a Muggle orphan wizard in the pure-blooded wizarding world. The writing was good and realistic, but there were some shortcomings, such as the protagonist's perspective being too heavy. However, it was not bad among the many doujinshi. I recommend it to readers who like HP doujinshi. My Wife Is a Peerless Expert, a fantasy novel written by Gao Sen. Gao Li had brought his AR eyes to travel through the ancient world, and he wanted to earn 100 million to build a true qi punk world. There were all kinds of interesting settings, such as the combination of true energy and technology. It was an Eastern fantasy farming novel. The main character's wife was amazing. Her recommendation index was four stars. "Tiger Taoist," is a Xianxia novel written by many brain fish. The protagonist raised a tiger to cultivate immortality and had a unique cultivation system. The main character was neither a saint nor an idiot. He relied on his skills to make a living. The adventures of immortal cultivation were very interesting. It was a good mortal cultivation novel. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Perhaps he has feelings for Hermione that he doesn't know how to handle. Harry might be afraid of these new emotions and so he acts cold as a defense mechanism. In some fanfictions, there could be a plot device where Harry has seen a vision of the future that makes him think being close to Hermione is dangerous for her. So, in an attempt to protect her, he acts cold. It could also be that there is some external pressure, like from other students or even teachers, that makes Harry think he should distance himself from Hermione, and this shows as cold behavior.
In some fanfictions, a cold Ravenclaw can be portrayed as having a sharp tongue. They use their intellect to make cutting remarks when others don't meet their standards of intelligence or logical thinking. This coldness could be a defense mechanism, protecting themselves from getting too involved with others. For example, when a Gryffindor challenges their view on a magical concept, they reply with a scathing rebuttal.
Since it's a fanfiction, it could have the main characters from the original series like Harry, Hermione, and Ron. They might be dealing with situations that involve cold fury in ways that J.K. Rowling didn't explore in the original books.
One key theme is survival. Harry has to find ways to stay alive in a world dominated by Voldemort. Another theme is resistance. He often tries to resist the Dark Lord's rule in secret.
The plot could be more complex and less focused on the simple good - vs - evil of the original. There might be more moral gray areas. Harry may have to make tough decisions that test his maturity, like choosing between the safety of his friends and the greater good of the wizarding world. Also, the relationships could be more nuanced, not as straightforward as in the original books.