Some Fairy Tail Spirits fanfiction focuses on the backstories of the spirits. How they came to be, their first encounters with wizards. It could be a story about a spirit's journey before being summoned by a Fairy Tail wizard, exploring different magical realms and meeting other magical creatures along the way.
One idea could be creating an OC celestial spirit that has a unique power related to time. For example, it can freeze time briefly in a small area. Another idea is an OC that has a special bond with a main character from Fairy Tail, like Lucy. Maybe the OC celestial spirit was once a human who was transformed into a spirit due to a powerful magic spell long ago. Also, you could write about an OC celestial spirit who has a conflict with the existing celestial spirit system and tries to change it for the better.
One idea could be exploring the backstories of the Celestial Spirits during the Eclipse event. Maybe some of them have hidden powers or relationships that are only revealed during this time.
One interesting story could be one that focuses on the character development within the Fairy Tail universe while still having a touch of the unique elements from 'Lemons Fanfiction'. For example, a story about a secondary character getting a chance to shine and their relationships evolving in a way that's not shown in the original series. However, it's important to note that 'Lemons' often implies more adult - themed content, so many platforms may not allow such explicit fanfictions.
One interesting Fairy Tail fanfiction could be about an alternate universe where the main characters have different magic abilities. For example, Natsu might have ice - based magic instead of fire. Another could focus on the backstories of the minor characters in more detail, like how Jet and Droy met before joining Fairy Tail.
A great Fairy Tail fanfiction might be one that gives a different ending to a major arc in the series. Instead of how it ended in the original, it could have a more bittersweet or even a completely different resolution. For instance, in the Tartaros arc, it could end with a different sacrifice or a new way of defeating the demons.
One interesting Fairy Tail fanfiction could be about an alternate universe where the characters have different magic abilities. For example, Natsu might have ice - based magic instead of fire. Another could focus on a romantic relationship between two characters that wasn't explored much in the original, like Levy and Gajeel's relationship in more depth.
In Fairy Tail celestial spirits fanfiction, writers get creative with the powers and personalities of the spirits. Some may give a spirit a backstory that wasn't explored in the original. For instance, Aquarius could have a past that involves an ancient water civilization, which adds more depth to her character and her relationship with Lucy.
One interesting Zoro Fairy Tail fanfiction could be one where Zoro from 'One Piece' somehow ends up in the world of 'Fairy Tail' and has to adapt to their magic system. He might start challenging the wizards there to sword fights, which would be really cool to read.
One interesting eclair fairy tail fanfiction could be about an eclair having magical powers in the Fairy Tail world. Maybe it's an eclair that can grant wishes to the mages in Fairy Tail, leading to all sorts of adventures as they try to find it. Another could be a story where an eclair is a key to unlocking a hidden magic within the guild.
There could be a fanfiction where the Fairy Tail members decide to live together in a huge mansion. Lucy might use her celestial spirit magic to help decorate the rooms. For example, Taurus could be used to move heavy furniture around. And they would have all kinds of adventures just within the house, like finding secret passages that lead to different magical realms.