I don't think so. Most fanfiction communities focus on more straightforward crossovers like having characters from Naruto and Fairy Tail interact, or exploring how their powers would work together. The concept of Naruto being the end of Fairy Tail fanfiction seems more like a very specific and personal idea that a particular writer might have rather than a widespread concept.
No, it's not a common concept. Naruto and Fairy Tail are two distinct anime/manga series. While there are crossover fanfictions between them, the idea of Naruto being directly related to the 'end' of Fairy Tail fanfiction is rather unusual and not something you'd typically see.
A Naruto - Ultear - Fairy Tail fanfiction could start with a magical portal that transports Naruto and Ultear to the Fairy Tail universe. Once there, they would have to adapt to the new environment. Naruto, being used to the ninja world, would find the magic in Fairy Tail both fascinating and different. Ultear, with her more serious nature, might initially struggle with the more light - hearted attitude of the Fairy Tail members.
One possible concept could be a story where a character from Fairy Tail somehow obtains the Sharingan from the Naruto universe. This could lead to all kinds of new abilities and storylines. For example, they might use the Sharingan's predictive abilities in battles within the Fairy Tail world, creating a whole new dynamic in combat.
It could be considered unique. Naruto and Fairy Tail are two distinct anime with their own unique worlds and characters. Combining Naruto as a 'devil' in a Fairy Tail fanfiction is not a typical or mainstream idea, which makes it stand out in the vast sea of fanfictions.
No. Naruto and Natsu are from different series, and their universes are quite distinct. Fanfiction communities usually like to keep the integrity of each series to a certain extent. While crossovers can happen, the idea that reading Naruto is Natsu fanfiction is not a common or widely - accepted concept as it seems to muddle the two separate identities of the series too much.
In the Naruto fan communities, it is a somewhat common concept. Fans enjoy the idea of Team 7 delving into the world of fanfiction as it can lead to humorous, heartwarming, or thought - provoking situations. It gives a new dimension to the characters, like Kakashi reading a fanfiction and having a chuckle at some of the outlandish ideas about his past or present. It also helps to build a stronger connection between the fans and the characters they love.
The concept of Naruto as a Dragon Slayer in Fairy Tail is quite fascinating. Naruto's chakra control could be translated into magic control in the Fairy Tail world. His backstory of being an outcast in his own village could parallel with some of the characters in Fairy Tail who also had difficult pasts. He could learn new spells and techniques from the Fairy Tail mages. Also, his presence in the guild would likely stir things up, as he has a very different fighting style compared to the regular Fairy Tail members.
Probably not. While there are a lot of Naruto and Fairy Tail fans out there, the idea of Naruto destroying Fairy Tail in a fanfiction is not something that is mainstream. Most fanfiction tends to focus on more positive interactions between different fictional worlds, like friendships or alliances. This concept of destruction might be a bit too dark or out - there for the general fanfiction - reading audience.
On the positive side, it could inspire some fans to try and bridge the gap. There might be some fans who see this divide and try to find common ground between Naruto and Fairy Tail. They could create fan works that combine elements of both in a positive way to try and change the negative perception.
I don't think it's a common concept. While both Harry Potter and Natsu are popular in their own right, their worlds are quite distinct. The Harry Potter series is centered around a school of magic, magic spells, and a battle against the dark forces. Natsu, on the other hand, has his own set of adventures in his fictional world. So, not many people might think of creating a fanfiction that combines them.
In fanfiction, Dark Lucy might be a part of a parallel universe story. In this universe, the events that shaped Lucy in the original Fairy Tail series happened differently. So she turned out to be 'Dark Lucy'. She could be a key figure in a war between light and dark forces in this alternate Fairy Tail world.