Their friendship can be developed by having them face a really tough challenge together. For example, if they are trapped in a dangerous magical maze. They would have to rely on each other's strengths. Lucy's intelligence and Aquarius' power could be combined to find a way out. This would deepen their bond.
In a story, their friendship could be further developed if Aquarius starts to open up more about her past and her feelings. Lucy could be there to support her. Maybe Aquarius has some regrets or fears that she shares with Lucy. And in return, Lucy can tell Aquarius more about her dreams and hopes for the future of Fairy Tail. They could also have some light - hearted moments like shopping together in a magical marketplace, just having fun and getting to know each other better on a more personal level.
One way to develop their friendship is through sacrifice. If Lucy has to give up something important to save Aquarius, or vice versa. This would show the depth of their care for each other. Also, they could train together. Aquarius could teach Lucy some unique water - based magic techniques while Lucy could share her knowledge of celestial spirit magic with Aquarius. Through this exchange of knowledge and mutual growth, their friendship would surely grow stronger.
Lucy could give Aquarius more freedom outside of the key. Let her experience the human world more often. They could go on adventures that are not related to Fairy Tail's main quests, just the two of them. This would allow them to get to know each other on a more personal level. Aquarius could also teach Lucy more about celestial magic and its deeper secrets, which would bring them closer as they explore this knowledge together.
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.
Lucy could be developed further by exploring her family background more deeply. Maybe she discovers some long - lost relatives who are also involved in magic. This could add new layers to her character. Another way is to show her struggling with her insecurities about her magic abilities and then gradually overcoming them through various challenges.
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.
Lucy could be developed by showing her struggle to control the more powerful star dresses. For example, she might initially be overwhelmed by the strength of a new star dress but gradually learn to master it through training and self - discovery. This would show her growth as a mage.
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 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.
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.
To develop Lucy's child character, start with their magic. If they inherit celestial spirit magic, show how they learn to summon and communicate with the spirits. Also, consider their personality. They could be brave like Natsu, or more calm and collected like Gray. Their relationships are important too. How they interact with the older Fairy Tail members can shape their character. For example, if they look up to Erza, they might learn about discipline from her.
For Lucy, you could develop her character by showing her growing more confident in her magic. Maybe she starts to experiment with new ways to summon her Celestial Spirits or combines their powers in unique ways. With Sting, you can explore his past more deeply. Show how his experiences as a Dragon Slayer have shaped his personality, and have him face some internal conflicts related to his power and identity. As for Rogue, you could develop his relationship with his shadow. Maybe he discovers new abilities within his shadow magic. Also, in the fanfiction, put them all in situations that force them to interact and grow together. For example, a mission where they have to protect a village from a powerful dark mage.