You could also do a time - travel themed fanfiction. The dragon slayers get sent back in time to the era when dragons ruled the land. They have to find a way to survive in that dangerous time while also trying not to change history too much. This would give a chance to show their adaptability and how they use their dragon slaying powers in a very different context.
One idea could be that the dragon slayers from different guilds team up for a super - difficult quest. Maybe they have to face an ancient dragon that is far more powerful than any they've fought before. This would lead to some really cool battles and interesting character interactions as they combine their unique skills.
One idea could be that Lucy discovers a hidden dragon slayer magic within herself and has to train with the other dragon slayers. Another could be a time - travel plot where Lucy and the dragon slayers go back in time to prevent a great dragon - related disaster. Or perhaps a story where Lucy is kidnapped by an enemy who wants to use her connection to the dragon slayers for evil purposes.
One idea could be that the dragon slayers discover the dragons they are slaying are actually being controlled by an even greater evil. So they have to team up with some of the dragons to defeat this new threat.
One interesting dragon slayers fanfiction could be about a young dragon slayer who discovers a hidden power within themselves. For example, they might find that they can communicate with dragons instead of just slaying them, which completely changes their view of the world and their mission.
One idea could be a fanfic where the Dragon Slayers have to team up to face a new, powerful dark dragon that is immune to their normal attacks. They would have to discover new powers within themselves.
Well, it could be that a new magic is discovered that is a combination of celestial and dragon slayer magic. Lucy and the Dragon Slayers start to experiment with this new magic. However, it has some unforeseen side effects that put them in danger. They have to figure out how to control this new magic while also dealing with other threats that are attracted by the new power they seem to possess. Also, Lucy might accidentally get transported to a parallel dimension where the Dragon Slayers are very different. She has to find a way to get back home while also helping the alternate - version Dragon Slayers with a problem in their dimension.
Another plotline might involve the dragon slayers teaming up against an ancient evil that threatens the entire world of magic. They would have to combine their unique dragon - slaying abilities to defeat it, like Natsu's fire - based attacks with other slayers' powers.
The dragons who trained the slayers can also be important characters in the fanfiction. Even if they are not always present physically, their influence on the slayers is significant. Their teachings and the bonds they formed with the slayers can be explored, like Igneel's influence on Natsu.
Well, one interesting plot could be the dragon slayers teaming up against an ancient and powerful dragon that was thought to be a myth. They might have to discover new magic powers within themselves to stand a chance.
One interesting plotline could be the dragon slayers facing a new, more powerful type of dragon that has emerged from a long - forgotten realm. They have to combine their powers in unique ways to defeat it.
A common characteristic is epic battles. Since they are dragon slayers, there are usually intense fights against dragons or other powerful foes. These battles are often described in great detail, with vivid descriptions of magic and combat techniques. Also, there is usually a sense of camaraderie among the slayers. They may start off as rivals but eventually come together for a greater cause. The fanfiction might also explore different magical elements related to dragon slaying, like special dragon - based spells or abilities.