The theme of self - discovery is quite prominent too. Natsu has always been a fire dragon slayer, so becoming a water dragon slayer makes him question who he is. Fanfictions might delve into his internal struggle as he tries to reconcile his old identity with his new powers.
One common theme is power and growth. As Natsu becomes a water dragon slayer, he has to learn to control his new powers, and the fanfictions often explore how he grows stronger. For example, he might face challenges that force him to adapt quickly.
Friendship is also a big theme. His relationships with his guild mates like Lucy, Gray, and Erza can change and develop in new ways. In some fanfictions, they might have to work together in different ways to help Natsu master his water - based abilities.
Power and its consequences are also common. The water dragon slayer gains great power, but they also have to deal with the responsibility that comes with it. Sometimes, there are themes of sacrifice, where they have to give up something to save others or achieve their goals.
One common theme is friendship. Their relationship as friends is often explored, like how they trust and rely on each other. Another theme is adventure. They usually go on some kind of adventure together, whether it's to defeat a new enemy or to discover something new. For example, in many fanfictions, they set out to find a lost magical item.
Power and responsibility is a common theme. As Natsu becomes a dragon god slayer, he has more power, but also more duties. Another theme is friendship. His friends in Fairy Tail still support him even as he changes. And there's often the theme of self - improvement, as Natsu has to master his new abilities.
Well, a cool plot might involve Natsu being transported to a parallel world where he is the only water dragon slayer. He has to adapt quickly to this new role and use his skills to fight against an evil force that is draining the water from that world. Also, he could meet alternate versions of his friends and have to convince them to trust him, since his powers are so different from what they know.
Lucy would be a great character to include. She could help Natsu research about water dragon slayer magic. Gray could also be there, and they could have some friendly rivalries regarding the different elements. Happy would be essential as Natsu's sidekick, providing comedic relief and also helping in some tricky situations.
One common theme could be redemption. Natsu, being an outlaw, might be on a journey to redeem himself for past misdeeds. Another could be power struggles, as he is a dragon slayer and there might be others vying for power or trying to control him. Also, friendship might be a theme, as he could be making new allies even in his outlaw status.
In 'natsu x oc dragon slayer fanfiction', a frequently seen theme is the struggle against dark forces. Natsu and the OC team up to fight various villains and protect the world. Another common theme is family. In the Fairy Tail universe, family is important, and the OC may find a new family in the guild, especially with Natsu as a close friend or more. Additionally, the theme of growth, both emotional and in terms of magical power, is a staple in these fanfictions.
In some fanfictions, there might be original characters created by the author. For instance, a mysterious figure who has some connection to Natsu's multi - dragon slayer abilities. This character could be an antagonist, testing Natsu's skills, or a mentor, guiding him to master his powers better.
It could be a powerful dark wizard who sees Natsu as a threat because of his alpha status among dragon slayers. This wizard might want to eliminate Natsu to gain control over the dragon slayers or to carry out some evil plan without interference.
Obviously, Natsu is one of the main characters. He is the strongest dragon slayer in this fanfiction. His friends from Fairy Tail like Lucy, Gray, and Erza are also likely to be main characters. They often support Natsu in his battles and adventures.