One idea could be that Aries discovers a new type of celestial magic that she has to keep secret from the other celestial spirits. She struggles with whether to tell Lucy or not, as it could put her in danger. Another plot could involve Aries getting lost in a different dimension while on a mission with Lucy and having to find her way back, all the while learning more about her own powers and past.
A fanfiction might focus on a love story between Leo and Aries. They could meet in the celestial spirit world during a time of upheaval. Leo, being the brave lion, protects Aries from the chaos. As they spend more time together, they realize their feelings for each other and have to navigate the challenges of being celestial spirits in love, like dealing with the rules of the spirit world and their contracts with their mages.
One great Aries and Leo fanfiction is 'The Celestial Bond'. It beautifully explores their relationship within the Fairy Tail universe. The author does an amazing job of bringing out their personalities. Aries' shyness and Leo's bravado play off each other really well in this story.
A common plotline could be Aries going on a solo adventure. She might leave the guild for a while to find out more about her past or her magic's origin. This could involve her facing various challenges on her own and coming back to the guild stronger and more self - assured.
One way to develop Aries' character is to give her new relationships. For example, she could form a friendship with a non - celestial spirit character in Fairy Tail. This would expose her to different ways of thinking and living. Also, you could show her learning new skills related to her celestial magic, like a more powerful form of her wool - based attacks. This would not only make her more powerful but also show her growth as a character.
Often, she is portrayed as a very kind - hearted character. Writers emphasize her gentle nature, especially when it comes to taking care of others in the guild. She is also seen as a bit shy at times, which adds to her charm.
Maybe a fanfiction where Leo and Aries are the only two celestial spirits left after a great war in the spirit world. They have to find a way to repopulate the spirit world. They travel to different realms in search of a solution, facing many dangers along the way. Along their journey, they learn more about each other's strengths and weaknesses and develop a deep bond that is more than just friendship.
In fanfics, Aries' character can be developed by making her more independent. Instead of always relying on others, she could take the lead in some adventures. For Leo, his leadership skills can be explored further. He could be given the task of leading a small team within the guild. Their relationship can also be developed by having them have disagreements. These disagreements can be about their different approaches to magic or how to handle a certain situation. Through resolving these differences, they grow both as individuals and as a duo in the Fairy Tail world.
Another plot could be Aries traveling back in time. She could end up in a time when the Fairy Tail guild was first founded and interact with the founders. This would give her a chance to see how the guild has evolved and also allow her to contribute to the early days of the guild in some unexpected ways, like using her knowledge of future events to prevent a disaster that could have ended the guild before it really began.
In a fanfic, their relationship could develop romantically. They might start by sharing small moments together, like watching the sunset after a mission. As they continue to interact, they find that they have a lot in common despite their differences. Aries' gentle nature softens Leo's more brash side, and Leo's passion makes Aries feel more alive. Their relationship could be a slow - burn one, with lots of tender moments and a few obstacles along the way, such as other characters being jealous or disapproving, but in the end, they could end up together.