The fanfiction could center around the origin of the Dragon King Festival. Maybe it was created as a peace treaty between humans and dragons long ago. But now, some dark forces are trying to disrupt it. The Fairy Tail guild has to step in and protect the festival. Lucy could use her celestial spirit magic to gather information, Gray could freeze enemies in their tracks, and Erza with her requip magic could lead the charge against any threats to the festival.
I think Natsu would be the most interesting. His brash and hot - headed nature combined with his powerful Fire Dragon Slayer magic would make for some exciting scenes during the festival. He would probably be the first to jump into any challenges or battles related to the festival.
Well, one possible plot could be that Tiamat arrives in the Fairy Tail world unexpectedly. At first, the Fairy Tail members might be on guard as Tiamat is a powerful and somewhat menacing figure. But then, Tiamat could turn out to have a noble reason for being there, like seeking help to stop an even greater evil that threatens both its own realm and the world of Fairy Tail. This could lead to an alliance between Tiamat and the Fairy Tail guild, with the members using their unique magic abilities in combination with Tiamat's power to face the new threat.
One possible plot could be Naruto being transported to the Fairy Tail world and discovers he has the power of a Dragon Slayer. He then joins a guild and starts going on quests with the Fairy Tail members. Along the way, he has to learn how to control his new powers while also facing off against powerful enemies that威胁 the guild.
Typically, the Dragon King in fanfiction might have super strength, the ability to fly at extremely high speeds, and control over dragon - related magic like fire or ice breath.
The Dragon King in Fairy Tail fanfiction could be a character that is related to the main characters in some way. Maybe it's a long - lost ancestor of Natsu or another dragon slayer. It could also be a villainous figure, bent on ruling over all the dragons and using their power to take over the world of Fairy Tail. In some fanfictions, the Dragon King might have a tragic backstory that led it to become the way it is, like being betrayed by humans in the past and now seeking revenge.
The plot might involve the water dragon slayer trying to find a way back to their own world of Fairy Tail while in the Naruto world. Along the way, they learn about the chakra system and how it's different from magic. They could also teach some of the Naruto characters about the power of dragon slayer magic. This could lead to some really interesting training scenes and battles where they combine their different powers. For instance, Naruto could use his shadow clones with the water dragon slayer's water attacks to create a more powerful offensive.
One of the common themes is adventure. The Dragon King in these fanfictions embarks on all sorts of adventures in the Fairy Tail world. There are also themes of friendship and rivalry. The Dragon King might make friends with some Fairy Tail members while having rivalries with others. And of course, the theme of magic is always present as the Dragon King's magic and the Fairy Tail magic interact in different ways in these stories.
Perhaps a magic spell in the Fairy Tail world goes wrong and creates a portal that sucks in some of the main characters from Dragon Ball Z. Vegeta, for example, would initially be angry about being in this strange new place but would soon realize that there are powerful foes and allies here. The Fairy Tail guild could hold a tournament to see who is the strongest among them and the Saiyans join in. This would lead to epic battles and also some comical moments as the two groups with very different cultures try to understand each other.
It could be about Natsu having left Fairy Tail for some reason and then reuniting with the guild in a very unexpected way. Maybe he has new powers or a different outlook on life that causes some friction and also some amazing moments of reunion and growth within the guild.
In this fanfiction, perhaps Natsu's return as a 'king' means he has a new level of leadership. He might bring back some lost magic or knowledge that helps Fairy Tail regain its former glory. For example, he could have found a way to defeat an old enemy that was once too powerful for the guild. His return could also stir up emotions among the guild members, like excitement, relief, or even some jealousy from those who might have risen in his absence.