A really interesting plot would be if the world of the fanfiction was facing a threat that only the fire dragon powers could stop. But the catch is that the current fire dragon slayers have to combine their powers in a way they've never done before. They would have to overcome their differences and learn to work together, all while dealing with the increasing danger to their world.
One idea could be exploring a new character who has a unique connection to the Heart of Fire. Maybe they are from a long - lost tribe that was once the guardian of it. They come to Fairy Tail seeking help to protect the Heart of Fire from an ancient evil that has awakened and wants to use its power for destruction.
One idea could be exploring the backstory of the Dragon Cry in more detail. Maybe there was a hidden power within it that was known only to the first dragon who created it. Another could be a story where a new character discovers the Dragon Cry and has to learn how to control its power before the bad guys get their hands on it.
Well, typically the main character would be a fire dragon slayer. They are the ones with the special connection to the fire dragon powers.
One idea could be a story where a character has the power to control both fire and water, which is unheard of in the Fairy Tail world. This character could be an outcast at first but then becomes a key figure in a big battle against a powerful dark force.
Maybe the fanfiction could focus on a dragon slayer who loses their powers but then discovers a new way to regain them. For example, they might have to go on a spiritual journey and face their inner demons. Along the way, they form new bonds with the members of Fairy Tail, which helps them in their quest.
One common plot idea is a crossover where characters from Fairy Tail and Dragon Ball Super meet. For example, Natsu from Fairy Tail could team up with Goku from Dragon Ball Super to fight a powerful villain that threatens both their universes.
One idea could be exploring the origin of the Eye of the Black Dragon. Maybe it was created by an ancient magic long forgotten. Another could be a story where a character has to protect the Eye from dark forces who want to use its power for evil.
A simple yet interesting plot could be a race. The White Dragon could be part of a race in the Fairy Tail world, and some Naruto characters get invited. Naruto, with his speed and determination, could compete against the White Dragon and other Fairy Tail mages. It would be a test of different powers and abilities.
A plot could involve Wendy using her Dragon Force to protect the Fairy Tail guild from a powerful dark magic user. She has to learn to control and enhance her Dragon Force abilities during the battle to save her friends. This could include her having to face her own fears and doubts about her power. For example, she might initially be afraid that she's not strong enough, but as the battle progresses, she realizes the true potential of her Dragon Force and how it's not just about raw power, but also about her connection to the dragons and her friends at Fairy Tail. In the end, she could defeat the dark magic user and become more confident in her abilities.
One idea could be an OC dragon slayer who has the power of a rare and ancient dragon. Their magic could have unique side - effects or abilities that no one has seen before. For example, instead of just breathing fire like a typical fire dragon slayer, they could create a special type of fire that can heal as well as destroy.