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.
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.
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.
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.
A fanfiction idea could be that Lucy's Celestial Spirit King Star Dress is coveted by a rival guild. They try to steal it from her during a grand magic tournament. Lucy, along with Natsu and the rest of Fairy Tail, has to protect the dress while also competing in the tournament. This leads to intense battles and strategic maneuvers, and in the end, Lucy realizes the true potential of the star dress not just as a power boost, but as a symbol of her connection to 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.
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 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.
The unique aspect could be the power - up Naruto gets. As a celestial spirit, he might have access to otherworldly powers that are different from his normal ninja skills. For example, he could have the ability to teleport between celestial realms, which would add a whole new dimension to his adventures.
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.