Perhaps in the fanfiction, there is a large - scale battle. Juvia could be overwhelmed by the enemy's numbers or power. She might fight bravely but in the end, be fatally wounded and die, leaving a huge impact on the guild and her friends.
One possible reason could be self - sacrifice. Juvia might give up her life to protect Gray from a deadly attack. She loves Gray deeply, so sacrificing herself for him would be in character.
Another reason could be a powerful curse. In the world of Fairy Tail, there are many dark magics. A curse could be placed on Juvia that eventually leads to her death, despite the efforts of her friends to save her.
They could leave for a quest of self - discovery. Natsu might want to learn more about his past, especially about his dragon, and Juvia could be looking to find out more about her water magic's origin. So they leave Fairy Tail to explore different places and meet various mages who might have the knowledge they seek.
One possible scenario could be Juvia sacrificing herself to save Gray. In the heat of a battle against a powerful enemy, Juvia might use her water magic to shield Gray from a fatal attack, but at the cost of her own life. Another could be that she succumbs to a dark magic that she was trying to fight off alone, not wanting to endanger her friends. Maybe she gets caught in a cross - fire between two extremely powerful magic users and her body is too weak to withstand the impact.
In some Fairy Tail fanfictions where Juvia dies, it could be a very emotional and impactful scenario. It might be due to a powerful enemy she couldn't defeat, sacrificing herself to save Gray or her friends. Her death could lead to Gray's character development, making him more determined to fight against the forces that took Juvia from him.
Gray would be devastated. He might go into a state of deep depression, isolating himself from the rest of the Fairy Tail guild. He would blame himself for not being able to protect her, especially if her death was related to her love for him. Gray would probably be filled with anger as well, and he would vow to take revenge on whoever was responsible for her death.
Another reason could be related to his loyalty to the guild. Gray might think that his focus should be solely on protecting Fairy Tail and its members. He could believe that a romantic relationship with Juvia would distract him from his duties. Also, there could be some unspoken guild rules or a sense of propriety that he feels would be violated by getting involved with her.
Well, it could make Gray feel an extreme sense of guilt. He might blame himself for not being able to protect her. And this could lead to him becoming more withdrawn and brooding, perhaps even pushing away his friends as he grapples with the loss.
One reason could be that the fanfiction author is trying to create a new and edgy storyline by making Natsu a more negative character. But this often doesn't sit well with fans who love the original positive and passionate Natsu.
Well, perhaps Juvia might punish Gray for always being cold and distant towards her in a comical way. Maybe she could freeze his clothes every time he ignores her feelings.
One great Fairy Tail Juvia fanfiction is 'Juvia's Redemption'. It shows Juvia in a new light, dealing with her past and growing stronger. Another is 'Juvia's True Love' which focuses on her relationship with Gray in a really heart - warming way. And 'Juvia's Adventure' takes Juvia on an exciting journey outside of the main Fairy Tail plot.
One fanfiction that stands out is 'Juvia's Magic Evolution'. This story is all about Juvia's magic getting stronger and evolving in unexpected ways. It has some really cool battle scenes where Juvia shows off her new powers. Another good one is 'Juvia's Family Ties' which explores Juvia's past family life and how it impacts her present in Fairy Tail. It's a story full of emotions.