A group of rogue dragon slayers who have gone bad could be the antagonists. They might envy Natsu's Lightning Flame Dragon Slayer abilities and try to take it from him. They could be causing chaos in the magical world, and Natsu has to stop them. They might have developed some new and dangerous techniques that Natsu has to figure out how to counter in order to defeat them.
An ancient dragon that has turned evil due to some dark magic could be the main antagonist. This dragon might see Natsu as a threat because of his unique combination of powers and wants to eliminate him. Natsu would then have to use all his skills and the help of his friends to fight this dragon. The dragon could also have minions that are constantly causing trouble for Natsu and his guild.
One idea could be Natsu learning new lightning - based attacks from a mysterious dragon. He could then use these attacks to defeat a powerful dark guild that has been terrorizing the region. Another plot could involve Natsu teaming up with other dragon slayers to face a threat that is immune to normal dragon slayer magic.
One great 'Natsu Lightning Flame Dragon Slayer' fanfiction is 'The Dual Elemental Power'. It shows Natsu exploring his new abilities in an exciting adventure. The story has great character development and the action scenes are really engaging.
A powerful dark dragon slayer who has mastered both shadow and ice magic could be a great antagonist. He could be jealous of Natsu's natural ability with fire and his popularity among the guild, and thus wants to prove his superiority.
Well, without reading it specifically, it could be about a fan - created story involving Natsu with some sort of lightning - enhanced flame dragon powers. Maybe it details his adventures, battles, or character development in a unique scenario that the fanfic writer has dreamed up.
Another factor is the potential for new storylines. The lightning - flame dragon slayer idea can lead to stories that involve exploring new magical realms, facing unique enemies, or even forming new relationships. Fanfiction readers are always looking for fresh and exciting stories, and this concept provides a great opportunity for that.
Another option is a rival dragon slayer who sees Natsu's transformation as a threat to his own status. This rival could try to stop Natsu from fully becoming a dragon or try to defeat him to prove his own superiority.
You can try looking on fanfiction websites like FanFiction.net or Archive of Our Own. They have a vast collection of fan - created works, and there's a good chance you'll find the 'natsu lightning flame dragon fanfic' there.
Well, Naruto is most likely one of the main characters since it's in the title. There may also be other characters from the Naruto series like Sasuke or Sakura. And if it's about a lightning dragon slayer, there could be new characters introduced, perhaps a mentor - like figure who teaches Naruto about slaying lightning dragons.
It could be another powerful mage who is jealous of Natsu's new war god slayer magic and wants to steal it for himself. This mage might have been researching ways to gain such powerful magic for a long time and sees Natsu as an obstacle to his own plans.
A powerful dragon - themed pirate could be the main antagonist. This pirate has a crew of dragon - like creatures and they are causing chaos across the seas. They have a grudge against Luffy for some reason, perhaps because Luffy has unknowingly entered their territory or stolen something valuable from them.