A possible plot twist could be that Natsu's dual dragon slayer powers are actually a result of some dark magic in the past. Someone might have experimented on him when he was a child, and this dark origin of his powers starts to surface and affect his behavior. His friends would then have to find a way to either suppress or purify these dark aspects of his powers without losing Natsu in the process.
Another plot twist could be the revelation of a hidden connection between Natsu's dual dragon slayer powers and an ancient prophecy. Maybe it was foretold that a dual dragon slayer would be the key to saving the world from a great evil, but also that this same person could bring about destruction if not guided properly. This would add a lot of moral and ethical dilemmas for Natsu and his friends.
A good plot twist could be that Natsu's Fire God Slayer magic is actually a curse in disguise. It was given to him by an evil entity that wants to use him for its own purposes. This would completely change the direction of the story and add a lot of mystery.
They can also create characters who are connected to Natsu's past regarding his dual dragon slayer powers. Maybe an old friend or a long - lost relative who knew the secrets behind how he got these powers. These characters can bring out different sides of Natsu, like his more vulnerable or determined side.
One idea could be Natsu exploring a new magic ability related to his dual dragon slayer powers. For example, he discovers a way to combine the fire of his Igneel - taught magic with the other dragon's element in a more powerful and unique way.
One great 'Fairy Tail Natsu Dragon Slayer Fanfiction' is 'The Dragon's Legacy'. In this story, Natsu discovers a hidden power within himself that is linked to his dragon slayer magic in a really unique way. It has exciting battles and great character development.
A good 'Fairy Tail Natsu Dragon Slayer Fanfiction' should have a strong plot. For example, it could involve Natsu facing a new and powerful enemy that forces him to use his dragon slayer skills in creative ways.
A common plot in Lightning Dragon Slayer fanfiction is the character facing a powerful enemy with lightning - related powers that are stronger than their own. This forces them to dig deeper and find new ways to use their slayer magic. For example, they might combine their lightning with other elements they've learned over time. Another plot could involve the slayer being transported to a different realm where the laws of magic are different and they have to adapt quickly. And sometimes, fanfictions explore the slayer's past and how they came to be a dragon slayer, like their relationship with their dragon mentor.
One great 'Fairy Tail Natsu Dragon God Slayer' fanfiction is 'The Dragon's Ascent'. It really delves into Natsu's growth as a Dragon God Slayer in a unique way. The author creates new challenges for Natsu that are both exciting and in - line with the Fairy Tail universe.
Another aspect is the world - building. Since it's set in the Fairy Tail universe, the fanfiction should expand on the existing lore. Maybe introduce new dragons or aspects of the Dragon God Slayer magic that we haven't seen in the original series. This makes the fanfiction feel like a natural extension of the Fairy Tail world.
A really unique plot twist can be found in 'The School that Changed Natsu'. Here, the school Natsu attends is actually a magical illusion created by an enemy. The whole school experience is a trap to keep Natsu and his friends away from Fairy Tail during a crucial time. Natsu has to figure out the truth and break free from this false reality, which leads to some intense and exciting scenes.
One possible plot twist could be that Lucy initially refuses Natsu's proposal because she fears it will change their dynamic in the guild. She might think that getting married will make them less focused on their adventures and more on domestic life.