She may spread false rumors about the guild's members. By using her connections and intelligence, she could make up stories that would damage the guild's reputation.
Lucy could try to steal important jobs or quests from Fairy Tail. Maybe she teams up with other guilds or individuals to outbid or outwit Fairy Tail in getting the best jobs.
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.
Another powerful mage from a rival guild. This mage could see Lucy's revenge as an opportunity to weaken Fairy Tail and offer their assistance.
One possible plot development could be that the guild members quickly realize Lucy is missing and start a search. Natsu, being her closest friend, might lead the charge. They could follow any clues left behind, like a piece of Lucy's clothing or a strange magical residue. Another development could be that the kidnappers demand a ransom from the guild in the form of a powerful magical item. The guild then has to decide whether to give in or find another way to rescue Lucy. Or perhaps Lucy manages to escape on her own using her Celestial Spirit powers. She could call upon one of her spirits, like Leo, to help her break free from her bonds and then find her way back to the guild while avoiding the kidnappers.
One possible plot could be that Lucy trains intensively with Natsu by her side for support. They might go on special quests to find magical items or training methods that can enhance Lucy's power. For example, they could search for an ancient spell book that has the power to unlock new celestial spirit powers for Lucy.
Another scenario could be that in a battle against a new, extremely powerful foe, Lucy is caught in a crossfire between two massive magical attacks. Despite her friends' attempts to protect her, she gets fatally injured and dies. This would have a huge impact on the other characters in the Fairy Tail guild, leading to themes of grief, revenge, and moving on.
It could be that Lucy leaves Fairy Tail because of a personal quest she has to undertake. This quest might be related to her family or her past, and she feels that she has to do it alone without the support or interference of the guild. She may plan to return once she has completed this important task.
Yes, there are likely fanfictions with such a plot. Fanfiction often explores different scenarios and relationships within the 'Fairy Tail' universe. However, not all of them are well - written or in line with the original spirit of the series.
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.
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.
The power balance in the fanfiction world could be different. Without Lucy, Fairy Tail might lack some of the strategic and magical capabilities she would have brought. At the same time, Lucy could be a major force in another part of the fictional world, changing the political and magical landscape there. It also means that the relationships and story arcs that typically involve Lucy in the original Fairy Tail story will be completely different, creating a whole new set of stories and interactions.
Another scenario could be a misunderstanding within the guild. Maybe a new member misinterprets Lucy's actions as a threat and attacks her. In the heat of the moment, before the situation is clarified, Lucy gets beat up. This could lead to a story arc about resolving misunderstandings and building trust within the guild.