What are the possible adventures that Lucy might encounter when she leaves to train in 'Fairy Tail' fanfiction?

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.

There could be a wandering mage at her home. This mage might be on the run from some powerful enemy and has sought refuge at Lucy's place. Lucy then has to decide whether to help the mage or turn them in, all while dealing with the potential danger this might bring to her and her family.

One possible plot could be that Lucy and Juvia leave Fairy Tail to go on a self - discovery journey. They might want to explore their individual magic powers more deeply without the constraints of the guild. Maybe they travel to different magical realms, meet new characters, and learn unique magic techniques that they can bring back to Fairy Tail later.

It could be a new character introduced specifically for the fanfiction. Maybe a powerful mage who has a vendetta against Lucy and somehow manages to drive her out of Fairy Tail by causing trouble for her within the guild.

Some members might be sad at first. Lucy, for example, would surely miss him a great deal as they are close friends. She might worry about him constantly during his absence.

It could be that there are some internal issues within Fairy Tail that make her leave while being pregnant. For example, there might be a prophecy or a curse that she believes could harm her baby if she stays. So, in order to break free from that potential threat, she decides to leave. Also, she may be facing some personal conflicts with other members of Fairy Tail regarding her pregnancy, like some not being supportive or having different views on how she should handle it, which ultimately drives her to leave.

Maybe they leave because they want to search for answers about their pasts. Happy might want to know more about his origins, and Lucy could be seeking something related to her family's history.

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.

Imagine an adventure where they are sent to the past. They have to ensure that an important event in Fairy Tail's history happens correctly. Lucy and Loki have to blend in with the past guild members without changing too much. This involves Loki having to hide his modern magic tricks and Lucy having to be careful with summoning her celestial spirits so as not to arouse suspicion.

In some fanfictions where Lucy dies, it often leads to a dark and somber turn for the other characters. Natsu, for example, might go into a deep rage or depression. Her death could be a catalyst for the guild to seek revenge against the force that caused it. It might also result in the guild falling apart for a while as they struggle to come to terms with her loss.