Well, a plot might be where Midnight has lost his memory and Erza has to help him regain it while protecting him from those who would take advantage of his vulnerable state. They could also be forced to team up in a magical tournament where they have to rely on each other's skills. For example, Erza's combat expertise and Midnight's unique dark magic could create some really cool fight scenes.
One idea could be that Midnight uses his magic in a new and unexpected way to save Erza from a powerful enemy. This would show a different side of his character, perhaps a more heroic one. Another plot could involve them going on a quest together to find a rare magical item that has the power to change the fate of Fairy Tail. During the quest, they could face various challenges that test their relationship and individual strengths.
Maybe in the fanfiction, Midnight discovers a prophecy that involves Erza and decides to protect her at all costs. They end up traveling to different realms within the Fairy Tail universe, each with its own set of rules and challenges. Along the way, they meet old friends and foes, and their relationship gradually changes from distrust to mutual respect and eventually something more. This would add a lot of depth to their characters and the overall story.
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.
A possible plot is that Naruto is mistaken for a powerful wizard in the Fairy Tail world. Erza initially doubts him but as they get into battles together, she realizes his strength. They have to work together to stop a ancient evil that is awakening. Along the way, Naruto's positive attitude starts to change the way the Fairy Tail guild members view things, and Erza becomes more open - minded due to Naruto's influence.
One idea could be that Midnight and Angel are on a mission together and they discover a hidden power that only works when they combine their magic. Another could be a story where they have to overcome their differences in magic types to save the Fairy Tail guild from a powerful enemy. Maybe they start off as rivals but gradually fall in love during their adventures.
One plot idea could be that the reader is a new mage in the Fairy Tail guild and Midnight takes an immediate interest in their unique magic. He then offers to train the reader, and during the training sessions, they develop a deep bond and face various challenges together within the guild.
A third plot could be that the reader is sent on a mission to infiltrate Midnight's guild. However, as the reader gets closer to Midnight, they start to have second thoughts. Midnight, who is very perceptive, senses the reader's internal conflict. Instead of turning the reader in, he decides to help the reader complete their mission in a way that doesn't harm his guild. This act of kindness makes the reader see Midnight in a new light, and a relationship begins to form.
One idea could be a story where Erza and Minerva have to team up to face a powerful new dark wizard. They start off distrusting each other due to their past rivalries, but as they battle together, they learn to respect and rely on one another.
One idea could be a story where Juvia and Erza team up for a dangerous mission. Maybe they have to infiltrate an enemy stronghold. Juvia's water magic can be used for stealth and distraction, while Erza's versatile combat skills handle the direct fighting.
One idea could be a story where Lucy and Erza have to team up to save the Fairy Tail guild from a powerful dark magic that's slowly corrupting it. They'd face many challenges and have to rely on each other's unique magic abilities. Another could be a time - travel plot where they go back in time and meet the founders of Fairy Tail and learn some long - lost magic techniques. Maybe they also have to change a certain event in the past to save the future of the guild.
One plot idea could be a young Erza on a quest to find a magical item that was lost in a hidden part of the Fairy Tail guild. She teams up with other young members and they face various challenges like tricky puzzles and small magical beasts. Along the way, she discovers more about her own magic abilities and the history of the guild.
One idea could be a story where they go on a quest together. Maybe they have to find a rare magical item. Natsu's impulsiveness, Mirajane's charm, and Erza's strict leadership combine in interesting ways during the adventure.