Gray and Juvia's relationship can be developed further. Suppose Juvia gets into a situation where she loses her memory. Gray then has to make her fall in love with him all over again. He could do this by showing her all the good times they had together through his memories. This process would not only strengthen their bond but also give Gray a chance to be more open about his feelings for Juvia that he may have been hesitant to show before.
For Natsu and Lucy, their relationship could develop further by having them go on a dangerous mission together where they have to rely solely on each other. In the face of great danger, they might realize their true feelings for each other more deeply. Maybe Natsu has to sacrifice his power to save Lucy, and this act of selflessness makes Lucy see him in a new light.
For Gray and Juvia's relationship, they could have more heart - to - heart conversations. Maybe they share their fears about the future and how to raise their family. As for their relationship with their children, they can have family outings where they teach important values like loyalty and courage, which are big in the Fairy Tail world.
For Freed, his character could be developed by exploring his past more deeply. Maybe there are some secrets about his family or his early days in magic that could be revealed. This would add more layers to his personality. For Rufus, we could see him struggle with the pressure of always having to remember everything perfectly. This internal struggle could change his character over time.
For Lucy, her character could be developed by showing her learning new and advanced celestial magic spells from Yukino. This would not only expand her magical abilities but also show her determination to grow stronger. For Yukino, she could be developed by showing her becoming more confident in making decisions outside of her guild's rules, influenced by Lucy's more independent nature.
Minerva could be developed by showing her more vulnerable side. In the original series, she is often seen as strong and intimidating. But in fanfiction, she could open up to Natsu about her fears and insecurities. For example, her fear of not being good enough despite her power. This would make her more relatable and humanize her character.
For Juvia, she could be developed by exploring her insecurities more deeply. Maybe she has a fear of losing Gray not just to another woman, but also to his own self - destructive tendencies. She could learn to be more independent while still maintaining her love for Gray. As for Lyon, he could be developed by showing his growth beyond his rivalry with Gray. He could start to focus more on his own identity and magic, and how he can contribute to the Fairy Tail guild in a unique way. Gray can be developed by confronting his past traumas more directly. He might have nightmares about his master's death, and through the support of Juvia and Lyon, he learns to heal and become a stronger wizard.
For Lucy, you could explore her celestial spirit powers more deeply. Maybe she discovers a new and rare spirit that has a special connection to Rogue or Sting's magic. For Rogue, his relationship with his shadow could be further developed. He might learn to use his shadow in new ways, and Lucy and Sting could play a role in that discovery. For Sting, his leadership skills could be tested and improved. They could be put in a situation where Sting has to lead a group that includes Lucy and Rogue, and he has to make tough decisions.
Putting Wendy in a leadership role within the guild for a fanfiction story would be interesting. She could learn to be more assertive and make tough decisions, which would help her grow as a character. It would also show how she can inspire others in the guild.
For Juvia, you could explore her more vulnerable side. In lemon fanfiction, she could be shown as being more hesitant about her relationship with Gray at times, not just her usual over - the - top loving self. This would add depth to her character.
Hisui could be put in situations where she has to make tough moral choices. For example, when faced with a decision that could benefit the kingdom but harm an innocent group of people. This would force her to think deeply about her values and develop her character in terms of ethics.