There could be a plot where Naruto's coldness is a result of a traumatic event in the Anbu. Maybe he witnessed something so horrible that he shut down his emotions to cope. And the story could revolve around him either slowly opening up again or becoming even more detached as he delves deeper into Anbu work. Plotlines might also involve him taking on extremely dangerous missions that only someone with his newfound coldness can handle, and how that affects his standing within the Hidden Leaf Village.
In such a fanfiction, Naruto's cold and emotionless state in the Anbu could lead to a much darker and more complex story. His lack of emotion might make his actions more unpredictable. For example, he could be more ruthless in carrying out missions, without the usual moral compass guided by his emotions. This could create tension within the Anbu and among his former friends who might not understand this new side of him.
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.
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.
He could be a sort of enigma. His role might be that of a lone wolf, going on solo missions that require stealth and quick decision - making without the interference of emotions. For instance, he could be sent to infiltrate a group of Hollows or a rogue Soul Reaper faction.
One possible storyline could be Naruto being sent on a top - secret mission as an Anbu. Due to his emotionless state, he approaches the mission with cold - blooded efficiency, making him a formidable but somewhat terrifying figure among his comrades. His lack of emotion might lead to some interesting interactions where others try to figure out what's wrong with him.
Well, if Naruto were an emotionless ANBU in a Bleach fanfiction, he might be a really efficient fighter. He'd probably approach battles in a very cold and calculated way, like how ANBU are supposed to be. Maybe he'd cross paths with some Bleach characters and they'd be quite shocked by his lack of emotion. For example, Ichigo might initially mistake him for an enemy with his stoic demeanor.
With his Anbu comrades, Naruto's emotionless state would create a sense of distance. They would find it hard to trust someone who doesn't show any emotions. However, some might respect his cold - efficient way of handling missions. In the long run, if he doesn't change, he might be isolated within the Anbu ranks, as relationships in the Anbu are also based on some level of mutual understanding and emotional connection.
One common theme is the struggle between duty and emotion. The Anbu are trained to be cold and efficient, but often the fanfictions explore their inner emotions that conflict with their duties. Another theme is secrecy. Since they are a secret organization, many fanfictions play around with the idea of hidden identities and secrets within the Anbu.
In cold emotionless Naruto fanfiction, a frequent theme is the change in Naruto's interaction with the ninja world. He may view it as a mere tool for his own ends. His training would lack the passion and determination that was driven by his emotions in the original story. Instead, it would be a cold, mechanical process. His view on the Akatsuki, for instance, would not be one of trying to understand their motives and redeem them but rather a cold, calculated approach to eliminating them as threats to his own goals.