One idea could be that the Fairy Tail mages discover a new world filled with Pokemon. They could form teams with the Pokemon and use their magic in combination with the Pokemon's abilities to fight against a common enemy. For example, Natsu could team up with a Charizard and use his fire magic along with Charizard's fire breath to create super - powerful fire attacks.
Another plot could be that some of the Pokemon have the ability to travel between their world and the Fairy Tail world. A group of Fairy Tail members, including Gray and Erza, are sent on a mission to find out why this is happening. Along the way, they befriend different Pokemon like Pikachu and Squirtle, and they all work together to solve the mystery and protect both worlds from any potential threats.
Maybe the Pokemon are being captured and used for dark magic in the Fairy Tail universe. The Fairy Tail guild then decides to rescue the Pokemon. Lucy could use her celestial spirits to communicate with some psychic - type Pokemon to find out where they are being held. This would lead to an epic adventure full of battles and rescues.
How about a plot where a Pokemon is cursed with a Fairy Tail - type of dark magic? The Pokemon becomes uncontrollable and starts causing chaos in both worlds. A group of Pokemon experts and Fairy Tail wizards must work together to find a way to break the curse. This could involve traveling to ancient and mysterious places in both universes, like the ruins of an old Pokemon temple or a forgotten Fairy Tail library where they might find the solution to the curse.
One idea could be that the Fairy Tail guild members discover a portal to the Pokemon world. They then team up with different Pokemon trainers to stop an evil organization that's trying to take over both worlds. For example, Natsu could befriend a Charizard and use its fire power in combination with his own to fight enemies.
One idea could be a Pokemon girl trainer who somehow gets transported to the Fairy Tail world. She could use her Pokemon skills and her Pokemon to help the Fairy Tail guild in battles, like using a water - type Pokemon to put out fires during a fight in a village. Another could be a Fairy Tail mage who discovers Pokemon eggs and starts to raise them, learning about the unique bond between a trainer and a Pokemon.
Maybe an OC who has the ability to communicate with spirits. In the 'fairy tail x oc fanfiction', this OC could discover that there are ancient and powerful spirits that are about to be awakened due to some dark magic ritual. The OC tries to enlist the help of the Fairy Tail guild to stop this from happening. Along the way, they face many challenges and also have to deal with the guild's initial skepticism about their powers and the existence of these spirits.
Another plot could involve a magic - based tournament where teams from both Fairy Tail and RWBY participate. This would allow for battles between different characters, like Natsu from Fairy Tail facing off against Yang from RWBY. The different fighting styles and power sources would make for exciting match - ups and also a chance for the characters to learn from each other.
One idea could be that the gamer's leveling system is applied to the Fairy Tail world. For example, the characters can gain XP by completing quests like in the game. They might level up their magic abilities in a more numerical way, similar to how a gamer levels up their character stats. Another plot could involve the gamer character introducing modern gaming concepts to the Fairy Tail guild, like mini - games for training or new ways to strategize during battles.
One plot idea could be that Natsu and Juvia are on a mission together in a mysterious, ice - covered land. Juvia's water magic is affected by the extreme cold, and Natsu has to use his fire magic to keep her safe while they search for a powerful, lost artifact. Along the way, they start to understand each other better and develop a deeper bond.
One idea could be that the reader is a new mage in Fairy Tail and Loke is assigned to train them. They start off bickering but gradually develop feelings. Another could be that the reader has a special power that only Loke can help them control, and through their shared experiences, they fall in love. Or perhaps the reader gets lost in a dangerous magical realm and Loke goes to rescue them, leading to a deep emotional connection.
One idea could be that the OC has a special power that Mavis senses and they form a connection through it. For example, if the OC can communicate with ancient spirits and Mavis, being an ancient and powerful mage, is intrigued by this ability. They could then embark on a journey to discover more about the origin of this power and in the process, develop a deep friendship or more.
One interesting plot idea could be Wendy and Erza teaming up for a special mission that no one else can handle. Maybe they have to go into a dangerous, enchanted forest where magic behaves strangely. Along the way, Wendy's healing abilities and Erza's combat skills complement each other, and they start to understand each other on a deeper level, forming a strong friendship that could potentially turn into something more in the eyes of the readers.