It might be that in this fanfiction, the writer wants to explore a different side of Naruto. By making him emotionless, they can create unique interactions with the Fairy Tail characters. For example, his lack of emotion could contrast sharply with Natsu's fiery personality, leading to interesting story developments.
It could work by making Naruto a more mysterious and brooding character. In Fairy Tail, there are many characters with different personalities. An emotionless Naruto would stand out. He might be more focused on achieving his goals without being distracted by emotions. For example, he could be on a mission to find a way back to his own world and his lack of emotion helps him stay determined.
His role could be that of a teacher. Since he doesn't have emotions clouding his judgment, he could teach the Fairy Tail members about self - control and the importance of thinking rationally. He could show them how to use their magic more effectively without being carried away by emotions like anger or pride. He might also introduce them to some ninja techniques that are based on discipline rather than raw emotion.
One possible plot could be that Naruto is transported to the Fairy Tail world and is somehow stripped of his emotions during the process. The Fairy Tail wizards then have to figure out how to send him back while also trying to restore his emotions. Along the way, Naruto's lack of emotion might cause him to make some uncharacteristic decisions that put everyone in danger.
One possible fanfiction could be that Naruto is transported to the Fairy Tail world through some magical anomaly. In a battle against a powerful dark mage in Fairy Tail, Naruto, not fully understanding the magic system there, gets badly injured. He has to rely on the kindness of the Fairy Tail guild members to heal and learn about their magic to get back on his feet.
One interesting fanfiction could be 'The Emotionless Naruto's Ascent'. In this, Naruto has become so detached from his emotions due to some dark events in his past. He starts to develop godlike powers as he delves deeper into some ancient ninja arts. He can now control natural elements in ways no one has seen before, like summoning a storm with just a thought.
In that fanfiction, it might be designed that way. Naruto has incredible powers in his own series, like his various jutsu. If translated into the Fairy Tail world in fanfiction, his skills could potentially make him very powerful. But it also depends on how the author of the fanfiction interprets and balances the power systems of both universes.
Well, in such a fanfic, it could be that Naruto is suddenly in the Fairy Tail world and the characters there mistake him for a baby. Maybe they try to take care of him in their own unique, Fairy Tail - style way. They might give him magic - infused baby food or put him in a crib made of enchanted wood.
Maybe there is a misunderstanding. Since it's a crossover fanfiction, communication between the two different worlds' characters might be difficult. So, Naruto could be misjudged and betrayed because of false assumptions.
The Sharingan in such a fanfiction could be used as a tool for a Fairy Tail character to gain an edge in their battles. They might initially struggle to control it, but as they learn more about it, they become a formidable force. For instance, they could use the Sharingan's genjutsu abilities to deceive opponents in the Fairy Tail battles.
In this fanfiction, Naruto could also be a guardian in a more metaphorical sense. For example, he could be the one to inspire the Fairy Tail members with his never - give - up attitude that is so prominent in the Naruto series. His experiences in his own world could be used to teach the Fairy Tail characters new ways of dealing with their problems. Also, his presence might stir up new relationships and rivalries within the Fairy Tail guild, creating a whole new set of stories and adventures.