Well, it depends on the fanfiction. Some fanfic authors may take a rather unorthodox approach and portray Naruto as secretly emotionless. However, this goes against the canonical Naruto who is full of emotions like determination, friendship, and love. But in the realm of fanfiction, anything can happen. It could be a creative exploration of how Naruto would act if he had some sort of emotional block or had been through some traumatic event that made him seem emotionless on the surface.
In Naruto fanfiction, an emotionless frozen Naruto can be a really interesting concept. It might be due to some dark magic or a traumatic event. This could lead to a very different story line, like his friends trying to bring back his emotions. Maybe he was frozen in time and lost his ability to feel during that process.
One idea could be that Naruto was experimented on by a secret organization in the fanfiction. They erased his emotions to turn him into a weapon against the Hidden Villages. This could lead to a story where his friends try to restore his emotions and bring him back to his true self.
His relationships take a big hit. His friends like Sakura and Shikamaru would find it hard to connect with him. Sakura, who's used to Naruto's warm and often goofy self, would be at a loss. Naruto's lack of emotion means he won't show the same level of care or enthusiasm towards her. With Shikamaru, their conversations would be very different. Shikamaru is used to Naruto's emotional outbursts and quick decisions based on feelings. Now, Naruto would be more reserved and logical, which could strain their friendship.
There are fanfics where Naruto is made emotionless by a curse. In these stories, his relationships with others are severely affected. Sakura might try to reach out to him, but he just stares blankly. Sasuke might not even recognize this new Naruto. The story could then revolve around the other characters' attempts to bring back Naruto's emotions, like they try different jutsus or find some magical cure.
One common theme is isolation. When Naruto becomes emotionless and godlike, he often isolates himself from his friends and the village. He feels that his new powers and lack of emotions set him apart. Another theme is the search for purpose. Since he has changed so much, he has to figure out what to do with his new abilities, like whether to use them for good or just to survive in a cruel ninja world.
In fanfiction, an emotionless Naruto at Hogwarts would probably be a solitary figure. He might focus solely on his studies and improving his magical abilities. Without emotions, he wouldn't get distracted by things like house rivalries or social dramas. He could approach magic in a very methodical way, much like he did with his ninja skills. However, he might also struggle to understand the importance of things like loyalty and friendship that are so highly valued at Hogwarts, until he experiences situations that make him question his lack of emotions.
He would probably be very aloof. He might not respond much to Ino's attempts at conversation. For example, if Ino tries to joke with him, he would just give a blank stare. He would focus solely on the mission - related tasks at hand and not engage in small talk or any emotional exchanges with Ino.
One key element could be Naruto's internal struggle. In an emotionless state as an Anbu, he'd have to deal with his past self. His ninja skills would likely be more cold - efficient. Another element might be his relationships. His friends would be confused by his new demeanor. For example, Sasuke might sense a change and be both curious and cautious. Also, the Anbu missions themselves would be interesting. He'd be sent on stealthy and dangerous tasks, and his emotionless state could be both an asset and a hindrance, like not being able to fully understand the motives of the enemies due to lack of emotional intuition.
The unique aspect lies in the contrast. Naruto is a character full of emotions, so an emotionless genius in the same story creates a strong contrast. It can lead to interesting character interactions and development. For example, the emotionless genius may have a completely different approach to problem - solving compared to Naruto.