Well, a plot idea might be that a powerful wizard wants to steal Aquarius' key from Lucy. Lucy has to fight to keep it. Along the way, she discovers that Aquarius has some hidden abilities that she didn't know about before. Another idea is that there is a prophecy about Lucy and Aquarius that they must fulfill together. They initially don't believe it but as events unfold, they realize they have to work as a team to save the world.
One idea could be that Aquarius gets trapped in a different dimension, and Lucy has to go on a dangerous quest to rescue her. She might have to team up with some unexpected allies from Fairy Tail. Another plot could involve Aquarius losing her memory, and Lucy has to help her regain it while also protecting her from those who would take advantage of her in this vulnerable state.
One plot idea could be exploring Aquarius's past more in - depth. Maybe a story where we see her life before she became a Celestial Spirit. Another could be a story where Aquarius has to team up with an unlikely character from Fairy Tail to save the Spirit World.
One plot idea could be Aquarius getting lost in the human world. She accidentally gets separated from the Celestial Spirit World and has to find her way back. Along the way, she teams up with some of the Fairy Tail members who are initially skeptical of her but then realize she's not as bad as they thought. Another idea is that Aquarius discovers a hidden power within herself that she didn't know she had. This power could be related to a long - lost magic that was once prevalent in the Celestial Spirit World. It could put her in danger as there are forces that want to control this power.
A plot could involve Freed accidentally casting a spell that links his and Lucy's minds. At first, it's a chaotic mess as they have to deal with suddenly sharing thoughts and feelings. But as time goes on, they start to understand each other on a deeper level. They use this newfound connection to uncover a plot within the Fairy Tail guild by a group of mages who are trying to undermine the guild's leadership, and in the process, their relationship blossoms.
One plot idea could be that Lucy discovers a cat with magical powers that is related to an ancient Fairy Tail legend. The cat could lead her on a quest to find a hidden treasure that was lost long ago in the world of Fairy Tail.
One idea could be that Lucy discovers she has hidden witch powers passed down through her family. Maybe she can use these powers to save the Fairy Tail guild from a new, powerful dark magic threat. Another plot could involve Lucy being transported to a parallel world where she is a well - known and feared witch, and she has to find her way back while also learning about her new - found powers in that world.
One plot idea could be that Hibiki and Lucy are on a joint mission. They discover an ancient magic artifact that has the power to either save or destroy the world. Along the way, they face various challenges and their friendship grows as they rely on each other's unique magical abilities to overcome obstacles.
One plot idea could be that Lucy and Lisanna team up for a special S - class mission. They face a powerful dark wizard who has the ability to control time. Along the way, they discover new magic spells and also learn more about each other's pasts. This would create a lot of action and character development.
One plot idea could be that Loke has to protect Lucy from a powerful dark magic user who is specifically targeting her celestial magic. Another could be a story where Lucy discovers a new and rare celestial key, and Loke helps her figure out how to use it. Maybe a plot where they get trapped in a magical realm and have to rely on each other to get out.
One idea could be that Lucy and Rogue are brought together by a powerful magic artifact. They have to team up to protect it from an evil force that wants to use it for destruction. Along the way, they start to understand each other's pasts and form a deep bond.