You could write a fanfiction where the members of Fairy Tail have to travel back in time to prevent the creation of Nirvana. This would involve a lot of interaction with the past versions of characters and seeing how they change the course of events. It could also show how the present - day relationships in the guild were shaped by the events related to Nirvana.
Another interesting concept is a story where a dark wizard tries to use the power of Nirvana in a different way than originally intended. The Fairy Tail members then have to figure out this new threat and stop it. Maybe the dark wizard is trying to use Nirvana to open a portal to a different dimension full of even more powerful and dangerous creatures, and Fairy Tail has to protect their world from this invasion.
Well, you could create a fanfiction where a new character enters the story during the Nirvana arc. This new character has a special power that can either enhance or disrupt Nirvana's influence. Maybe they are related to the ancient magic that created Nirvana in the first place. Or you could focus on the emotional side of the characters during this arc. Like how they deal with the fear and chaos that Nirvana brings, and how their relationships change because of it.
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.
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.
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.
One idea could be to explore the backstory of a minor character in 'Fairy Tail Book 1'. For example, you could write about how a particular guild member joined the guild. Another idea is to create an alternate timeline where a key event in the book didn't happen or happened differently, like if Natsu didn't find Happy. You could also focus on a relationship, such as the friendship between Lucy and Erza, and show how it developed further through new adventures not in the original book.
Another idea is that the Fairy Tail guild is captured in a magical dimension created by an ancient enemy. The story could focus on how they survive in this strange new world and find a way to break free. It could involve exploring the unique rules and creatures of this dimension. For example, they might have to solve puzzles or perform certain tasks to gain their freedom.
One idea could be exploring an alternate universe where the main characters have different magical abilities. For example, Natsu could have ice - based magic instead of fire. Another could be a story centered around the backstories of the guild masters before they founded their respective guilds. Maybe a story about how Makarov started Fairy Tail and all the challenges he faced in the early days.