The power - struggle theme is quite common. Each trying to prove their power is greater. Then there's the theme of self - discovery. As they interact, they learn more about themselves. And mystery is also a theme. There could be a mystery that only they can solve together in the fanfiction world.
If we consider the magical aspects of their powers, a Dragneel's power might be more raw and instinctive, while a Fullbuster's power could be more controlled. When they interact, the Dragneel's power could add intensity to the Fullbuster's ice spells, making them more powerful and long - lasting. Or the Fullbuster could use his ice to contain and direct the Dragneel's fire, creating a more focused and destructive force.
Since 'lemon' fanfiction often crosses the line into adult content, we should focus on the proper characteristics of Gray in regular fanfiction. Gray is known for his stoicism, his rivalry with Natsu, and his strong sense of justice. These traits should be the focus rather than any improper aspects that might be in 'lemon' fanfiction.
One thing that might make it unique is the combination of different fictional universes. Naruto and Etherious come from very different settings, so the crossover itself is distinct. The character of Dragneel could add another layer of uniqueness if he has a special role or ability in the story.
Well, I'm not sure how widespread it is, but it's possible to find such fanfiction. Writers often like to mash - up different universes to create something new. In a 'Harry Potter is Natsu Dragneel' fanfic, you might expect to see Harry with Natsu's determination and love for his friends translated into the context of the wizarding world. Maybe he'd be more brash and use his 'fire - like' magic in a more aggressive way like Natsu does.
A common plotline is the rescue mission. His friends from Fairy Tail band together to find and save him. Another is Natsu trying to break free on his own. He might use his fire magic in creative ways to escape his bonds.
I'm not sure specifically if there is a fanfiction solely about Gray Fullbuster being kidnapped. There are so many fanfictions in the Fairy Tail fandom, and while kidnapping plots are common, it might be a bit rare to find one that focuses only on Gray in this situation. You could try searching on major fanfiction websites like Fanfiction.net or Archive of Our Own.
I really like 'Storm Fullbuster and the Lost Magic'. In this fanfiction, Storm discovers a long - lost magic that changes his role within the Fairy Tail guild. It's full of action and mystery. There's also 'Fullbuster's Redemption' which focuses on Storm's journey to make up for past mistakes and become a more respected and powerful mage.
The plot also matters a great deal. It could be an adventure where Gray and the OC team up to defeat a powerful enemy, or it could be a more character - driven story about them dealing with personal issues. A good plot keeps the readers engaged and makes them want to keep reading to find out what happens next. Additionally, the writing style should be engaging, with good grammar and vivid descriptions.
One great Gray Fullbuster time travel fanfiction is 'Gray's Time - Hopping Adventure'. It takes Gray on a journey through different time periods in the Fairy Tail universe, facing challenges and meeting past versions of his friends. It's a thrilling read with a lot of character development.