The 'rivalry turned friendship' trope is also common. Characters from Naruto and Fairy Tail who start off as rivals gradually become friends as they learn more about each other. This is often used to build character relationships and drive the plot forward. Team - up tropes are also quite popular, where characters from both series join forces to face a greater threat.
Many fanfictions also use the 'lost in a new world' trope. This can be a great way to explore the different settings of the two series. A Fairy Tail character lost in the Hidden Leaf Village, for example, has to figure out how things work there. It creates opportunities for humor, adventure, and character growth.
A common trope is the 'power - up' trope. In a fanfiction, a character might gain the power of the Rinne Sharingan and use it to become super - powerful in the Fairy Tail world. This could lead to them quickly rising through the ranks of the Fairy Tail guild. Another trope is the 'fish - out - of - water' trope. A Naruto character with the Rinne Sharingan in the Fairy Tail universe would be like a fish out of water, not understanding the magic system at first but gradually learning and adapting.
The friendship - across - universes trope is also big. Characters from Naruto and Fairy Tail form strong bonds despite coming from different worlds. For example, Naruto and Natsu becoming best friends and fighting side by side against common enemies. Their different fighting styles and personalities complement each other, making for an exciting story.
The 'rivalry' trope is quite common. A powerful Otsutsuki could be seen as a rival to the strongest mages in Fairy Tail. There's also the 'redemption' trope. Maybe an Otsutsuki who has been on the wrong path could find a new way of life in the Fairy Tail world with its emphasis on friendship and second chances. And of course, the 'epic battle' trope where the combined forces of Naruto and Fairy Tail characters fight against a common enemy, like an even more powerful Otsutsuki or a dark magic - using villain.
One common trope is the power - up. The main character, often from Naruto's world, might gain new and unique powers from the Fairy Tail universe. For example, they could learn Fairy Tail magic on top of their ninja skills. Another trope is the relationship building. In a harem setting, the main character forms deep bonds with multiple characters from both series. There's usually a lot of comical misunderstandings among the characters in the harem as well, like when a character misinterprets a friendly gesture as a romantic one.
The popularity of 'Naruto x Fairy Tail' fanfictions lies in the combination of two very popular anime worlds. Fans of both shows get to see their favorite characters interact in new and unexpected ways.
In many of these fanfictions, a common trope is the 'power of love' trope. It's where their love for each other gives them extra strength or helps them overcome difficult situations. Also, the 'unexpected love' trope is often used. Given their relationship in the original series as more of friends and guildmates, fanfiction writers like to show how this unexpected romantic relationship can develop. There's also the 'shared trauma' trope sometimes, where they bond over a difficult event they've both experienced in the Fairy Tail story.
One popular trope is the 'gamer in a new world' where the main character, often from our world, gets transported into the Fairy Tail universe and uses their gaming knowledge to their advantage. For example, they might know strategies from RPGs that help them in battles in the Fairy Tail world.
One popular trope is the struggle for power. The necromancer in Fairy Tail fanfiction often has to deal with the power they possess. They might be tempted to use it for wrong reasons like revenge or domination. Another trope is the outcast status. Since necromancy is often seen as a dark art in the Fairy Tail universe, the necromancer character is usually an outcast, shunned by the regular guild members. And then there's the redemption arc. Some fanfictions show the necromancer trying to redeem themselves and use their powers for good, despite the initial negative perception.
The 'romantic crossover' trope is also quite popular. Picture Edward falling for a Fairy Tail mage or vice versa. It adds an interesting dynamic to the story, mixing the brooding love of Twilight with the more flamboyant relationships in Fairy Tail. There's also the 'team - up' trope, where characters from both series join forces to face a common enemy, which often leads to some exciting battles and plot developments.
One popular trope is the 'relaxation and bonding' trope. In many fanfictions, the characters go on vacation to relax after all their battles. They get to bond in new ways, like having a campfire and sharing stories. Another is the 'romantic getaway' trope. For example, Natsu and Lucy might go on a vacation just the two of them and their relationship develops further in a more peaceful setting.