Well, if we consider Lucy as a Dragon Slayer in fanfiction, her magic could be really different from the traditional ones. Maybe she'd have a connection to a celestial dragon, which would be so cool. It would combine her existing celestial spirit magic with the new dragon slayer powers. She could use the stars as a source of power, similar to how other dragon slayers use elements, and it would be a fresh take on her character.
One idea could be that in a post - Dragon Cry adventure, Natsu and Lucy are sent on a mission to a hidden island where ancient dragon magic is said to be sealed. Along the way, they face various obstacles that test their bond, like a powerful sorcerer who tries to split them up. Another plot could involve Natsu losing his dragon slayer powers temporarily, and Lucy having to protect him while they search for a way to restore his powers using the knowledge from the Dragon Cry incident.
Their relationship could develop through shared danger. For example, if they are trapped in a magical maze as a result of the Dragon Cry's after - effects. Natsu's impulsive nature might get them into trouble, but Lucy's strategic thinking gets them out. This mutual reliance can deepen their bond. Also, if Natsu discovers a new side of Lucy, like her hidden strength or a special magical ability she has been suppressing, he may start to see her in a new light, which could lead to a more romantic development.
Well, she could start off being an outcast in Fairy Tail because her ice powers seem so different from the rest. But then she proves her worth by using her ice dragon slayer magic to save the guild from a powerful water - based enemy. The ice would counter the water and she'd become a hero.
Lucy as an Ice Dragon Slayer could have a very different story arc. Her magic could attract the attention of dark guilds who want to use her power for their own evil purposes. She would then have to fight not only to protect herself but also the people she loves in Fairy Tail. Her training to become a stronger ice dragon slayer would involve learning how to control the cold and use it in combat in the most effective ways.
One possible scenario in the fanfiction could be that Lucy discovers she has latent dragon slayer abilities. This could start with strange dreams or unexplained powers she starts to exhibit. Her journey to understand and control these powers would be filled with self - discovery.
She could gain water dragon slayer powers after a magical accident. For instance, if she was caught in a magical explosion near a water - based artifact. Her powers could include being able to breathe underwater, which would open up new exploration opportunities for her and the guild. She could discover underwater ruins or hidden treasures.
Another possibility is that Lucy's Water Dragon Slayer powers are a result of a curse or a long - lost family heritage. As she delves deeper into understanding her powers, she uncovers secrets about her family's past. She might have to face off against an evil force that is also connected to her new powers. Along the way, she forms a special bond with the water element, seeing it as not just a tool for fighting but also a source of comfort and strength.
If Lucy never joined Fairy Tail, the friendships and relationships among the characters would form in a very different way. Also, many of the story arcs might not unfold as they do in the original plot.