One interesting plot could be that Lucy's sister, who has been hidden away for some reason, suddenly shows up in the Fairy Tail guild. She might have a unique magic that no one has seen before, like the ability to control time on a small scale. This could lead to all sorts of adventures and challenges for the guild members as they try to figure out how to handle this new power.
Another plot could be that Lucy's sister is actually from a different dimension. She accidentally ends up in the Fairy Tail world and has to adapt quickly. Her different way of using magic, which is based on the laws of her own dimension, causes some confusion but also helps the guild in unexpected ways. For example, she can create portals to places that were previously unreachable, opening up new storylines for exploration.
One interesting plot could be Lucy traveling back in time to the founding of Fairy Tail. She could then meet the original members and influence the guild's early development in unexpected ways, like helping to create some of the guild's most important rules.
One interesting plot could be that after being run over, Lucy discovers she has a new magical power. Maybe it's a power that allows her to communicate with the spirits in a more profound way, and she uses this newfound ability to save the Fairy Tail guild from a great danger.
A plotline could also involve Lucy having to team up with an unlikely group of characters, perhaps some former enemies or characters from other guilds. Together, they have to face a common threat that is much larger than any of them could handle alone. This forces Lucy to use her wits and her magic in new and creative ways, and also develops her relationships with these new allies in unexpected ways.
She might use her celestial spirits in unexpected ways against the guild. For example, she could have her spirits create illusions to embarrass the members.
One way to develop her character is by making her have a special goal. Let's say she wants to become the most powerful mage in the world, not for glory, but to protect Lucy. This goal drives her actions and decisions throughout the fanfiction. She trains hard, seeks out powerful opponents to test herself, and along the way, she has to face her own weaknesses and fears. Through these experiences, her character becomes more complex and well - rounded.
In some fanfictions, Hughes and Lucy could be in a love triangle with another character from Fairy Tail. This would create a lot of drama and tension. For example, if there's a misunderstanding between Hughes and the third character about Lucy's feelings. It could lead to some intense confrontations and emotional moments as they all struggle to figure out their relationships within the context of the Fairy Tail guild.
One idea could be a crossover where Naruto and Lucy team up to fight a common enemy. Maybe a powerful dark mage from Fairy Tail's world has somehow made its way into the Naruto universe and is causing chaos. Naruto's ninja skills combined with Lucy's celestial spirit magic would make for an exciting battle.
A popular fanfiction idea is that Lucy and Sting are transported to an alternate dimension. In this strange new world, they have to rely solely on each other to survive. They learn to work together in ways they never thought possible. As they search for a way back home, their relationship blossoms into a strong partnership filled with mutual respect and admiration.
One interesting concept could be exploring how Lucy from Edolas adapts to the Fairy Tail world. Maybe she has different magical abilities or a unique perspective on friendship compared to the original Lucy.
A great fanfiction idea could be that Lucy and Leo get transported to an alternate dimension. In this dimension, the rules of magic are different, and they have to figure out how to get back home while also dealing with the strange new magical creatures and challenges there. This would test their relationship and their individual skills.