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.
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.
Well, you can try looking on popular fanfiction websites like FanFiction.net or Archive of Our Own. Just search for 'Fairy Tail Lucy leaves' and you'll likely find some great ones. Some might have high ratings and reviews which can be a good indicator of quality.
If Lucy never joined Fairy Tail, the friendships and relationships among the characters would form in a very different way. Also, many of the story arcs might not unfold as they do in the original plot.
Well, if we consider Lucy as a Dragon Slayer in fanfiction, her magic could be really different from the traditional ones. Maybe she'd have a connection to a celestial dragon, which would be so cool. It would combine her existing celestial spirit magic with the new dragon slayer powers. She could use the stars as a source of power, similar to how other dragon slayers use elements, and it would be a fresh take on her character.
You can try searching on fanfiction websites like Archive of Our Own or FanFiction.net. Just type in 'Lucy Frosch Fairy Tail' in their search bars, and you might find relevant fanfictions.
There's a fanfic titled 'Married Life in Magnolia' which focuses on their day - to - day married life. It includes Natsu being his usual goofy self and Lucy trying to keep him in line while they both deal with the challenges of being a married couple in the Fairy Tail guild.
One possible fanfiction could be that Lucy is invited to a grand ball in the magical world. As she enters the ballroom, a mysterious melody starts playing. Lucy, being the confident and graceful character she is, starts to dance. Her celestial spirits watch in awe as she twirls around, her dress flowing with each movement. It could be a dance that not only showcases her beauty but also her connection to the magic within her, as she uses a bit of her magic to create a sparkling effect around her while she dances.
In some fanfictions, Lucy might be portrayed as a friend to Frosch. She could be someone who looks out for the little Exceed, given her kind - hearted nature in the Fairy Tail series.
There is a fanfiction called 'Lucy in the Alternate Realm'. This one is interesting because it sends Lucy to an alternate realm where she has to find her way back. Along the way, she meets different versions of her friends and has to use her wits and magic to survive. It's a great read for any 'Fairy Tail' and Lucy fan.