Maybe in the fanfiction, a Fairy Tail wizard somehow acquires the Sharingan. This could lead to a whole new set of adventures as they learn to control it. They might use it to predict the moves of their enemies in battles, like during a fight with a powerful dark guild. They could also use it to analyze complex magic spells and find weaknesses in them.
One idea could be a character with Sharingan abilities being transported into the Fairy Tail world. They could use their Sharingan to copy the magic of Fairy Tail wizards. For example, copying Natsu's Fire Dragon Slayer magic and using it in unique ways.
One idea could be an OC with the Sharingan who joins Fairy Tail and uses their Sharingan abilities in battles. For example, they could use the Sharingan to predict opponents' moves and counter them effectively, adding a new dynamic to the guild's battles.
You could do a time - travel fanfiction. Have a character go back in time to when the Fairy Tail guild was first founded and see how they interact with the founders. Or, write a story where the characters swap powers. So, Erza would have Lucy's celestial magic and Lucy would have to use Erza's requip magic. This would lead to a lot of comical and also challenging situations for them. Also, you could write a fanfic about the guild taking on a mission in a completely new and strange land, filled with magic they've never seen before.
One idea could be exploring an alternate universe where the main characters have different magic abilities. For example, Natsu could have ice - based magic instead of fire. Another idea is to focus on the backstories of the minor characters in more depth, like how they came to join Fairy Tail. A third idea would be to create a time - travel fanfiction where characters go back in time to change a significant event in the Fairy Tail world.
One idea could be exploring an alternate universe where the main characters have different magic powers. For example, Natsu could have ice - based magic instead of fire. Another idea is to focus on a backstory for a minor character, like how they came to join the guild. Maybe a story about a character's journey to find a long - lost magical artifact that has a connection to Fairy Tail's history.
You could write a Fairy Tail fanfiction centered around a character's growth. For instance, take Wendy. You could write about her journey to master new and powerful dragon - slayer magic, facing challenges that force her to grow not only in power but also in confidence and leadership skills. It could involve her going on a solo adventure to a far - off land to learn from a reclusive dragon.
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.
One idea could be Wendy going on a solo adventure to a far - off land in the Fairy Tail universe to discover a new type of magic. She could meet unique characters and face challenges that test her skills and growth as a mage.
A possible fanfiction could involve a Fairy Tail mage getting the Mangekyou Sharingan somehow. This could lead to them having to deal with the dark side of the Sharingan, like the loss of eyesight over time. At the same time, they could use the Sharingan's powers, such as predicting opponents' moves, to become a stronger mage in the Fairy Tail guild.
One interesting storyline could be Naruto using the Sharingan to copy the magic of Fairy Tail wizards. He could then combine his ninja skills with the copied magic, creating unique fighting styles. For example, he might copy Erza's requip magic and use it to quickly change his ninja tools during battle.
One idea could be to set the Fairy Tail characters in a modern-day high school. Natsu could be the trouble - making but kind - hearted delinquent, and Lucy could be the new student who gets drawn into his wild adventures. Another idea is to have them in a modern city where magic is a secret but still exists, and they have to fight against an evil corporation that wants to use magic for their own gain.