Writers may also justify it through a prophecy. If there was a prophecy that stated only Lucy's death could break a powerful curse on the guild or on a particular character, then her death becomes a part of a bigger, fated plan. In this case, she might accept her fate bravely, knowing that her sacrifice will bring about positive change in the end.
Some writers justify Lucy's death by making it a noble sacrifice. For example, she might give up her life to close a portal that would otherwise release a great evil upon the world. This way, her death is seen as necessary for the greater good of the entire Fairy Tail universe, including all the kingdoms and innocent people in it.
In some fanfictions, Lucy's death could be due to overusing her magic power. She might be in a situation where she has to push her limits to save her friends from a dangerous enemy. By overexerting herself, she loses her life. This is justified as her selfless love for her friends drove her to take such a risk, and it shows the depth of her character and her loyalty to Fairy Tail.
When Lucy dies in a fanfiction, it might cause a rift among the guild members. Some may blame themselves for not being able to protect her. Her death could also be the start of a new adventure as the characters search for a way to resurrect her. This could lead them to explore new magical realms or encounter new enemies. Plus, it could change the power balance in the guild as her celestial magic was quite unique and important.
Happy, Natsu's companion, would also be very sad. He was used to Lucy being around and would miss her presence. The whole Fairy Tail guild would be in mourning. Erza, for instance, would feel a great sense of loss as Lucy was like a little sister to her. This could lead to changes in the guild's dynamics, with some members becoming more withdrawn while others might try to be stronger to honor Lucy's memory.
Some writers portray it as a very emotional event. Lucy might be shown as heartbroken but determined as she walks away from the guild she loves. Her friends are often shown as being in shock or trying to persuade her to stay.
The guild as a whole would be in mourning. They would hold a big memorial for her. Her death could also inspire some of the younger members to train harder so that they can prevent such tragedies in the future. For instance, Wendy might focus more on her healing magic, hoping to be able to save lives in similar situations in the future.
One possible scenario could be that she sacrifices herself to save her friends from a powerful dark magic. In the chaos of a huge battle, she might use all her magic power to create a shield that protects everyone else but drains her life force completely.
In some fanfictions of Lucy's death in Fairy Tail, a heartbreaking scene could be when her friends find out she sacrificed herself to save the guild. They might come across her lifeless body surrounded by the remnants of the great battle she fought. It's a moment of shock and extreme grief for them, realizing they've lost such an important member.
Writers develop Lucy by putting her in situations that test her courage and resourcefulness. For instance, she might be trapped in a magical maze and have to use her wits and celestial spirit powers to escape. This shows her growth and adaptability. For Natsu, his character can be developed by showing how he learns from his mistakes. In a fanfiction, if he makes a wrong move during a fight that endangers Lucy, he could then strive to be more careful and strategic in future battles. This not only develops his character but also deepens his relationship with Lucy as they both grow together in the story.
Some writers justify it by creating a situation where Sasuke has to make a great sacrifice. For example, he might give his life to protect Naruto or the Hidden Leaf Village from an overwhelming threat. His selfless act in these scenarios is seen as a way to atone for his past mistakes and show his growth as a character.
One great Fairy Tail Lucy fanfiction is 'A New Adventure for Lucy'. It takes Lucy on a journey where she discovers a new type of celestial magic. Another interesting one could be 'Lucy's Hidden Power' which delves into her family's past and reveals a secret power she has. And then there's 'Lucy and the Lost Kingdom' where she stumbles upon an ancient, forgotten kingdom and has to face many challenges there.
They might also develop it through small, everyday interactions. Like Gray bringing Lucy her favorite drink when she's feeling down, or Lucy helping Gray pick out a new shirt. These simple acts can slowly build up their relationship over time. In many fanfictions, the characters' personal growth also plays a part. As Gray becomes more in touch with his emotions and Lucy becomes more confident, they are more likely to recognize and act on their feelings for each other. It's a gradual process that makes the relationship seem more real and believable.