A possible plot could be that the girl from Galuna is in a coma due to a dark spell. Natsu, being the determined and kind - hearted person he is, sets out to find a way to break the spell. He travels to different magical places, meets various wizards, and overcomes many challenges. In the end, when he finally breaks the spell, the girl wakes up and they realize their feelings for each other have grown deeper during this arduous journey.
One idea could be that they go on a quest together to find a rare magical item that is said to have the power to save Galuna Island from a new threat. Another could be that the girl from Galuna has a special power that Natsu needs to unlock his own new level of magic. Maybe they start off as rivals, competing to be the best in a magical tournament but then gradually fall in love as they discover more about each other.
Perhaps a powerful demon that has a grudge against Galuna Island. The demon sees the girl as a key to getting revenge on the island. Natsu, being the hero, would stand in the way. The demon could have minions that constantly try to capture the girl, creating a lot of action - packed scenes in the fanfiction.
Well, you could write a fanfiction where a member of Fairy Tail gets lost on Galuna Island alone. During their time alone, they discover a new form of magic that is exclusive to the island. This discovery could lead to internal struggles as they try to master this new magic without the help of their guildmates. At the same time, they have to survive the island's harsh environment and fend off any threats, all while trying to find a way back to the guild.
One idea could be that the OC has a special power that attracts Natsu and the other harem members. For example, the OC can control a unique type of magic that is crucial in saving the world, and Natsu is drawn to her courage. Another plot could involve the OC being from a different dimension and Natsu has to help her adapt to his world while falling in love. And perhaps there could be a rival in the harem who tries to drive the OC away from Natsu.
In 'natsu x lucy family fanfiction', an interesting plot could be that Natsu and Lucy's family discovers an ancient prophecy related to their family line. The prophecy foretells that their family will play a crucial role in saving the magical world from a great evil. As they try to understand the prophecy, they encounter various challenges. Their family might have to travel to different parts of the magical world, meet new allies and enemies. Also, the kids in the family could start to show unexpected powers as they grow up, which adds more to the family's journey in fulfilling the prophecy.
One idea could be that Natsu is betrayed by his closest friends in the guild, and in his time of despair, a group of female characters form a harem around him to help him heal and regain his confidence. For example, Lucy could be the first to reach out, using her celestial magic to show him there are still things to fight for. Another plot could involve Natsu being betrayed by a powerful dark mage who manipulates his guild against him. The harem, which might include Erza, Wendy, and others, then trains Natsu in secret to become stronger and take revenge on those who wronged him.
One idea could be that Natsu and Mirajane start a family in a peaceful post - guild - war era. Their kids inherit unique magical abilities from both of them and they have to train and guide their children through the magical world's challenges.
Perhaps the OC is from a different dimension where magic works in a strange way. Natsu, Mirajane, and Erza are intrigued by this. They team up to help the OC understand and control their magic in the world they are in now. Along the way, they encounter a powerful dark wizard who wants to use the OC's unique magic for evil. So, they have to fight together to protect the OC and the world from this threat.
Well, perhaps Natsu turned into a girl could lead to a story where she has to go undercover as a female in an all - female magic group. This would force her to learn about the different culture and magic techniques of women - only groups. Or maybe she gets involved in a beauty contest in the magical world by accident, and her friends from the guild have to help her out while she's in this new form.
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 a story where Natsu and Erza Knightwalker are on a mission together in a strange land. They face numerous challenges that force them to rely on each other more and more, leading to a deepening of their relationship. Their different personalities, Natsu's impulsiveness and Erza Knightwalker's more stoic nature, could create some really engaging character dynamics.