The Time Squad could be on a mission to prevent a powerful magical artifact from Fairy Tail's past from being stolen in the present. They enlist the help of the Fairy Tail guild members who are experts in magic and know the history of the artifact. Together, they have to face off against a group of thieves who are also after the artifact for their own evil purposes.
A plot idea could be that a villain from the Fairy Tail universe has found a way to travel through time and is causing chaos in different eras. The Time Squad and the Fairy Tail wizards have to join forces to stop this villain. The Fairy Tail wizards use their magic to fight the villain's minions in different time periods, while the Time Squad uses their time - traveling skills to keep up with the villain and figure out his master plan.
Maybe the Fairy Tail wizards could accidentally get sucked into the Time Squad's time - traveling device. This would lead to them having to work together to get back to their own time and place. The Time Squad could learn some magic from the Fairy Tail characters, and the Fairy Tail characters could learn about time manipulation from the Time Squad.
One idea could be a character traveling back in time to prevent a major disaster in the Fairy Tail world, like the destruction of a key guild building. This would involve them having to figure out the cause of the future event in the past and deal with the different versions of their friends and enemies at that time.
A plot could involve Natsu going back in time to a time of great danger for the guild, a threat that was previously unknown in the present. He has to use his present - day skills and knowledge to fight this threat. But he also discovers some secrets about the guild's founders and their powers that were lost over time. This knowledge could be crucial in not only saving the past but also making the present - day Fairy Tail even stronger.
Maybe the goddess of time gets trapped in a time loop within the Fairy Tail universe. As she tries to break free, she has to enlist the help of the Fairy Tail members. They go on various adventures to find the items or perform the spells needed to break the loop, all while facing their own personal challenges.
One idea could be a new character arriving at Fairy Hills and having to adapt to the unique living situation. They could face challenges like getting along with the different personalities of the Fairy Tail mages living there.
One idea could be a war between the Powerpuff Girls and the villains from Dexter's Laboratory. Maybe Mandark teams up with Mojo Jojo to create a super - weapon, and the Powerpuff Girls have to use all their strength and wits to stop them. Another idea is a war in the world of Adventure Time, where the Ice King tries to take over all the kingdoms in Ooo with an army of his ice minions. Finn and Jake would then lead a resistance against him.
Another plot could involve Bardock having to adapt to the magic - based society of Fairy Tail. He might initially struggle with understanding how magic works, but then discovers a way to combine his Saiyan power with the magic there. For example, he could learn to use ki - based attacks in harmony with Fairy Tail's elemental magics. This would create a unique fighting style that surprises both his allies and enemies.
One idea could be a crossover adventure where characters from Fairy Tail and Negima team up to fight a common, powerful enemy. For example, they might face a dark wizard who has the ability to steal magic from both worlds.
One idea could be that the main couple from Fairy Tail goes on a honeymoon to a magical island. There, they discover a hidden ancient magic that they have to protect from villains who also find out about it. Another plot could involve them facing relationship challenges during the honeymoon, like misunderstandings due to magic gone wrong. For example, a spell makes one of them forget parts of their relationship, and they have to work through it to rekindle their love.
In a 'Fairy Tail WW2 Fanfiction', a possible plot could be that the guild discovers a hidden magical dimension that is somehow connected to the events of WW2. They enter this dimension to try and stop a dark force that is influencing the war from the shadows. Some of the characters could form alliances with real - life military personnel who are open - minded enough to accept their help. This would lead to interesting interactions between the magical and non - magical worlds during the war.