Another plot could be that Naruto was experimented on by Root to be emotionless. He is then pitted against his old friends in a battle. His friends try to reach out to the old Naruto inside him during the fight. This leads to a series of internal struggles within Naruto as he starts to feel the faintest glimmers of his former emotions resurfacing.
Well, perhaps a plot where Orochimaru manages to get his hands on Naruto and uses some dark experiments to turn him into an emotionless tool. Naruto then starts to carry out Orochimaru's bidding, like stealing valuable scrolls from other villages. Or maybe in a parallel universe, the Akatsuki capture Naruto and brainwash him into an emotionless tool to use against the Hidden Leaf, and his friends have to find a way to break the spell.
Perhaps Naruto is cursed by a powerful jutsu that turns him into an emotionless killer. He begins to hunt down the shinobi who he believes are threats to the Hidden Leaf, not caring about the consequences. However, his friends like Sasuke and Sakura notice the change and try to break the curse. They embark on a journey to find a way to reverse the effect while also protecting Naruto from himself.
A plot might involve Percy being experimented on by a rogue group of demigods or even a minor god. As a result, he becomes emotionless. His lack of emotions could lead to some really strange situations. For instance, he doesn't show any joy when reuniting with his mother or any sadness when his friends are in danger. His friends initially think he's been replaced by an impostor. But as they figure out what happened, they have to find a way to reverse the experiment. This could involve going on a quest to find a rare ingredient or artifact that can restore his emotions.
One idea could be that Naruto, in this fanfic world, is emotionless due to some dark magic. In the Bleach universe, he could be a rogue soul reaper who doesn't follow the normal rules because of his lack of emotions. For example, he might befriend Ichigo but in a very cold and calculating way, using Ichigo's power for his own ends without really feeling any guilt or friendship in the true sense.
One idea could be that Naruto wears the emotionless mask to hide his true feelings of pain and isolation after a major event in the village. He might be using it as a way to distance himself from others while he figures out his new place in the world. Another plot could involve the mask being a magical or cursed item that slowly starts to change Naruto's personality, making him more cold - hearted than he really is.
In an 'emotionless Naruto fanfiction', it could be that Naruto loses his emotions after a great loss, like the death of Iruka Sensei. He shuts down emotionally and becomes a lone wolf, focusing only on missions. However, his friends, especially Sasuke, realize that he needs to regain his emotions to truly be himself and start a journey to help him.
One idea could be that members of Root are sent to infiltrate the Hidden Leaf under the guise of being friendly shinobi. They cross paths with Naruto and his friends. Naruto, being the perceptive one, senses something off about them. This could lead to a series of battles and mind games as Naruto tries to expose their true motives.
One plot idea could be that Naruto is a celestial being sent to the human world on a mission. He has powers far beyond what normal ninjas possess, like the ability to control the elements on a much larger scale. For example, he could stop a natural disaster by simply willing it. Another idea is that he's a spirit in a human form, and he has to find a way to return to his spirit realm while still protecting the village. This could involve him learning about his true identity through a series of mysterious encounters.
Well, a plot could involve Naruto being initially ostracized in the village because of his deafness. But then, he proves his worth by using his unique perspective. Since he can't hear, he becomes extremely observant of body language. This helps him in battles and also in understanding the true feelings of people around him. He could also form a special bond with a character who is also an outcast, perhaps someone with a disability of their own, and together they change the perception of the village towards those with differences.
A possible plot is that Naruto's blindness is a result of a powerful enemy's attack. This forces him into a new world of darkness, but also reveals hidden powers within him. He could start to see things in a different way, not literally but metaphorically. His new - found understanding could lead him to be a better leader. For instance, he might be able to understand the pain of the oppressed in a more profound way, and thus fight for their rights more vehemently. His blindness could also be a way to bring out the best in his friends, as they rally around him to support and protect him.