Maybe all the Fairy Tail guys except Lucy lose their memories. She then has to go on a journey to find a way to restore their memories while also protecting the guild from threats that are taking advantage of their weakened state. This would put a lot of pressure on Lucy and show her growth as a character.
A plot twist could be that the Fairy Tail guild is actually a test created by a powerful wizard, and the Fairy Tail guys and Lucy are the chosen ones. But they don't know this until they start to notice strange things happening. This would completely change their perspective on their lives in the guild and their relationships with each other.
A great plot twist could be that one of the Fairy Tail guys, like Loke, is actually a double agent working for an enemy guild. Lucy discovers this and has to decide whether to trust him again or turn him in. It would create a lot of internal conflict for her.
Another fanfic could focus on Lucy's relationship with Erza. Maybe they team up for a tournament within the Fairy Tail guild. Along the way, they face tough opponents and have to rely on each other's strengths. Lucy's strategic thinking combined with Erza's powerful combat skills would make for an exciting story.
One great fanfiction is 'A New Adventure'. It shows Lucy in a whole new adventure where she discovers a hidden magic. The story has great character development for Lucy and interesting plot twists.
A good one should have strong character portrayal of Lucy. For example, it should capture her determination and kind heart. If it can show her growth as a wizard, that's even better.
One possibility is that it focuses on a love story between Lucy and Rufus. They start off as rivals, perhaps competing in a magic competition. But as they get to know each other better, they realize they have more in common than they thought and fall in love. This could involve them sharing their dreams and fears, and overcoming obstacles together to be with each other.
In some fanfictions, Lucy's departure from Fairy Tail could be part of a self - discovery arc. She could feel that she has outgrown the guild in a way, or that she needs to explore the world on her own terms. So she leaves, travels to different places, studies different forms of magic, and then returns to Fairy Tail as a much more powerful and confident mage, ready to contribute even more to the guild.
One possible plot twist could be that Lucy initially refuses Natsu's proposal because she fears it will change their dynamic in the guild. She might think that getting married will make them less focused on their adventures and more on domestic life.
Another plot twist could be related to his journey of self - discovery. As a guy reborn as Lucy, he has to come to terms with his new identity. He might struggle with the physical and emotional aspects of being a female in the Fairy Tail universe. This internal conflict could drive the story forward as he tries to find his place within the guild and the world at large, all while dealing with the challenges that come with being Lucy Heartfilia.
Well, in some fanfictions, a plot twist could be that Future Lucy actually has a hidden power that she didn't know about until she traveled to the past. This power then becomes crucial in solving the problems in the past and also has implications for her own future. Also, there might be a plot twist where she discovers that the reason for her coming to the past was not what she initially thought. Maybe it was all part of a bigger plan by a character who has been manipulating events from the shadows all along.
Yes, there are quite a few out there. You can start by looking on popular fanfic websites like Archive of Our Own. Just search for 'luffy x lucy heartfilia' and you'll find a variety of stories with different plotlines and writing styles.
One possible plot could be that Midnight uses his magic to trap Lucy in a dream - like world. In this world, he challenges her to various magical tasks. As they interact more, Lucy starts to understand Midnight's past and the reasons behind his actions. Eventually, she manages to break free from the dream world using her Celestial Spirit magic and in the process, Midnight has a change of heart and decides to turn away from his evil ways.