In a Naruto - Fairy Tail fanfiction with a Water Dragon Slayer, one idea could be that the slayer is from a hidden village that has some connection to Fairy Tail's world. The slayer's abilities would be quite useful in Naruto's world. They could use their water dragon slaying magic to fight against the Akatsuki, for instance. Their magic could be a great asset in battles, especially in areas where there is a lot of water or moisture. It would be cool to see how the Naruto characters react to this new type of power.
Yes, 'The Water Dragon's Legacy' is a good one. It has a strong plot where the main character, an orphaned ninja, discovers a hidden scroll that contains the secrets of an ancient and powerful Water Dragon jutsu. As he tries to master it, he faces opposition from a powerful and secret organization within the ninja world that wants to keep this jutsu for themselves.
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.
There might be a fanfiction where the Water Dragon technique is combined with some other elements or ninjutsu in a creative way. For example, a fanfic could show a character fusing the Water Dragon with lightning to create a more powerful and electrified version of the attack. It could also involve a story of rivalries between different ninja clans who all want to master this new form of the Water Dragon jutsu.
The Water Dragon Jutsu could be modified to carry other elements within it. For example, the user could infuse lightning chakra into the water dragon. So when the dragon attacks, it not only hits with the force of water but also delivers electric shocks. This would be a great new battle strategy as it combines two different elements for a more powerful and unexpected attack.
It could be a new character created specifically for this fanfiction. This character could be a young water dragon slayer who gets lost between the two worlds. They would be the main focus as they try to adapt to the Naruto world while still having their Fairy Tail powers.
The Water Dragon Slayer could fit in by being a foreign visitor. They might come to the Naruto world seeking something, like a special type of chakra that is similar to their magic source. They could then get involved in the local conflicts, using their water - based powers to help or cause trouble depending on their motives.
One great Naruto Water Dragon Slayer fanfiction could be 'The Water Dragon's Legacy'. It might explore a character with the power of a water dragon slayer in the Naruto universe, dealing with how they interact with the existing ninja clans and their unique abilities. Another could be 'Water Dragon's Ascent', which perhaps focuses on the training and growth of such a character, facing various challenges in the ninja world while harnessing their water dragon slayer powers.
Well, one unique feature is the combination of two different power concepts. Naruto has its own set of ninja abilities and when you add the water dragon slayer power, it creates a whole new dynamic. For example, the way water jutsus can be combined with water dragon slayer attacks is really cool.
Maybe in the fanfiction, the Water Dragon Jutsu has been corrupted by an evil force. Naruto and his friends have to find a way to purify it. They might need to travel to an ancient water temple where they face various trials and battles with dark water creatures that were created due to the jutsu's corruption.