In the 'lucy becomes a celestial spirit fanfic', perhaps Lucy discovers a hidden power within herself that has a connection to the celestial spirits. As she tries to understand this power, she gradually takes on the characteristics of a celestial spirit. She could start having the ability to communicate with them on a deeper level and even access their powers in a unique way.
The fanfic could start with Lucy being in a difficult situation where she feels powerless. Then she stumbles upon an ancient spell or artifact related to the celestial spirits. As she delves into it, she starts to change. She may face opposition from some characters who fear her new powers or don't understand her transformation. Along the way, she has to learn to control her new celestial spirit - like abilities and use them for good, all while trying to maintain her relationships with her friends from her previous life.
It could be a dark wizard who wants to use Lucy's new celestial spirit powers for his own evil purposes. He might try to capture her and force her to do his bidding.
Well, it could start with Lucy being in a situation where she witnesses the destruction caused by a celestial dragon. This event stirs something deep within her, and she decides she wants to be able to protect everyone from such a threat. So, she embarks on a journey to become a celestial dragon slayer. She may travel to different realms or seek out rare magical items that can enhance her abilities. As she progresses, she could form alliances with other powerful mages who share her goal or have knowledge about celestial dragons. And gradually, she builds her skills and reputation as a celestial dragon slayer.
In the fanfic, the fan OC could be from a parallel universe where they are a huge fan of Lucy's story. A portal between the universes opens up, and as they step through it, they gradually become Lucy. This change could be accompanied by a series of challenges. For example, they have to learn to use Lucy's powers, which they only knew about from a spectator's point of view before. And they also have to face the fact that they are now in a world where they are no longer just an observer but a key part of the story.
One possible story could be that Sakura Haruno discovers a hidden magic that allows her to transform into a Celestial Spirit. She might first struggle with the new powers and form. For example, she could find it difficult to control her new celestial body, which might be made of stardust or pure energy. As she adapts, she could use her skills as a ninja, like her quick reflexes and strategic thinking, in the celestial realm. Maybe she teams up with other celestial spirits to fight against a common enemy that threatens both the celestial world and the ninja world she comes from.
A fanfiction plot could revolve around Lucy being cursed. The curse affects her ability to use the Celestial Spirit King Star Dress properly. She then has to go on a quest to find a cure, traveling to different magical lands and meeting new characters. Along the way, she discovers secrets about the star dress that were previously unknown, like it having a hidden power that can only be unlocked under certain conditions. As she searches for the cure, she also has to fend off those who would take advantage of her weakened state.
In a 'Fairy Tail Lucy becomes a Dragon Slayer' fanfic, it could start with Lucy being in a life - threatening situation. To survive, she unknowingly absorbs the power of a dying dragon. This power starts to change her. At first, she is scared of the changes. But then, with the support of her friends, she decides to embrace it. She then begins a journey to master her new powers. She might learn that her Dragon Slayer magic is linked to a special type of celestial spirit that has dragon - like qualities, and she has to find and bond with this spirit to fully control her powers.
It could be about Lucy having an adventure in the world where celestial dragons exist. Maybe she befriends one or tries to change their cruel ways.
One possible plot could be that Naruto is somehow transported to the world of celestial spirits and has to find a way back home. Along the way, he discovers new powers and makes friends or enemies among the celestial spirits.
Perhaps an ancient sorcerer who has the ability to control celestial dragons. He sees Lucy as an obstacle to his domination over the world using the power of these dragons. He would use his vast knowledge of magic and his control over the dragons to try and defeat her.
Well, one possible plot could be about Lucy's journey through her pregnancy. Maybe it focuses on how she prepares for the baby, like decorating the nursery. It could also show her dealing with the physical and emotional changes. For example, she might be excited but also a bit scared at the same time.