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.
A cool idea for a Fairy Tail fanfiction is to write about a character who has lost their magic and has to find a way to get it back without relying on the typical methods in the Fairy Tail world. This could involve seeking out ancient magic artifacts or making a deal with a mysterious magic - user. Another concept is to write a story centered around the guild's annual festival but with a twist, like an evil force trying to disrupt it. And then there's the idea of writing a story from the perspective of the guild's pets or mascots, like Happy or Carla, seeing the adventures through their eyes.
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.
In this type of fanfiction, the way the relationships develop over time can be really interesting. Maybe it starts with a simple friendship among a group of characters and gradually evolves into a polygamous relationship. The emotional growth of each character involved, like how they overcome jealousy or insecurities, is an important aspect. Also, the way the fanfiction might re - imagine the Fairy Tail universe to accommodate such relationships, perhaps with new social norms or magical elements related to the relationships, can make for a very engaging read.
Another interesting concept is to set the harem fanfiction in an alternate universe where Fairy Tail is more like a school. The different characters are students with their own unique personalities and magic abilities. The main character, a transfer student perhaps, then becomes the center of a harem as they make friends and enemies within the school.
One idea could be a story where a rogue mage from a different guild infiltrates the Fairy Tail guild and causes chaos among the members. They could be stealing important artifacts or trying to disrupt the relationships within the guild.
One idea could be that a long - hidden enemy infiltrates the guild by befriending a new and naive member. This new member unknowingly helps the enemy gather information about the guild's defenses and secret magic. Another could be a character who feels betrayed by the guild's leadership for a decision that seems unfair, like not being allowed to go on a certain important mission. So they start to plot against the guild.
One idea could be a crossover where the Fairy Tail mages enter the world of Pokegirls. They could form teams with different Pokegirls and go on adventures together. For example, Natsu could team up with a Fire - type Pokegirl and use their combined fire powers to defeat villains.
One idea could be exploring the backstories of the Edolas versions of the main Fairy Tail characters in more detail. For example, how did Edolas Natsu become the way he is? Another idea is to create a story where the Fairy Tail guild from Earth - land has to team up with their Edolas counterparts to fight a common, powerful enemy that threatens both worlds. Maybe a new, dark magic has emerged that only the combined strength of both guilds can combat.