One way is to make the boggarts a part of a quest. For instance, the guild could hear about a powerful boggart that holds a key to an ancient magic. So they embark on a journey to find and defeat it. Along the way, they learn more about the nature of boggarts and how to combat them. This would add an element of mystery and adventure to the fanfiction.
They could be incorporated as a new threat that the guild has to face. Maybe a dark wizard has unleashed a horde of boggarts on Magnolia, and the Fairy Tail members have to use their unique magic to defeat them.
Well, it could be incorporated as a new form of magic. A character in Fairy Tail might discover an ancient spellbook that has a similar power to Kamui. This discovery could change the power dynamics in the guild and lead to new adventures.
Mermaids could be introduced as a new species that live in the deep, unexplored parts of the ocean in the Fairy Tail world. They could have their own magic system related to water and sea life. For example, they might be able to communicate with sea creatures and use them in battles.
One way could be through a crossover spell. Maybe a powerful mage in Fairy Tail accidentally creates a portal that brings Vegito into their world. Then Vegito's incredible power would be a huge shock to the Fairy Tail guild, and he could either be an ally or a misunderstood foe at first.
If we think about it, an S - Rank Naruto ability in a Fairy Tail fanfiction could also be something that is coveted by the villains. Let's say a dark guild wants to steal the power of Naruto's Sharingan (if a character with Sharingan was brought into the Fairy Tail world). They might think it's an S - Rank power that could help them achieve their evil goals. This would then lead to a big conflict where Fairy Tail has to protect this Naruto - based power from falling into the wrong hands.
One way is to create characters in the real world who possess the magic abilities seen in 'Fairy Tail'. For example, a character could have Natsu's fire - breathing magic and use it to fight crime in a modern city. Another approach is to set up guild - like organizations in the real world where people with different 'Fairy Tail' - inspired powers come together to complete missions or help the community. Also, you could have real - world locations become the settings for 'Fairy Tail' - style adventures, like an ancient forest being the site of a quest for a magical artifact.
They could be a key to a hidden treasure. In the Fairy Tail world, there could be a legend that says the scarlet lilies hold the key to a great treasure. So the characters go on a hunt for these lilies. Another way is as a power source. Maybe some dark wizard wants to use the energy of the scarlet lilies for evil, and the Fairy Tail guild has to stop them.
In a Fairy Tail fanfiction, the Wood Release could be a lost magic. A character, perhaps a descendant of a long - lost civilization, discovers they have the ability to use Wood Release. They could use it to protect their guild or to fight against dark mages. The Wood Release could be used to create barriers made of thick, impenetrable wood or to trap enemies in a forest of magically - grown trees.
It could be incorporated as a McGuffin. For example, the characters hear rumors about the planetary anchor and its great power. They then go on a quest to find it. Along the way, they encounter various challenges and enemies related to those who also seek the anchor.
One way is through their different personalities. Natsu is hot - headed and impulsive, while Mirajane is more composed and mysterious. This contrast can create a sense of entropy as their relationship develops. For instance, Natsu's sudden decisions might throw Mirajane off balance, and she has to adapt, which adds an element of chaos and change to their bond.
One way could be through a magical portal. Maybe a powerful mage in Fairy Tail accidentally creates a portal that links to the Naruto universe and Madara somehow gets sucked through it. Then he could use his powerful jutsu in the Fairy Tail world, creating all sorts of chaos and new storylines.