Well, perhaps there could be a plot where the Akatsuki from Naruto are after a powerful Fairy Tail artifact. They team up with some of the darker guilds in Fairy Tail to get it. But then, the main heroes from both Naruto and Fairy Tail have to work together to stop them. This would bring in a lot of action - packed scenes with different fighting styles clashing. There could also be some interesting character development as the Naruto characters learn about the Fairy Tail concept of guild loyalty and the Fairy Tail characters understand the importance of friendship in Naruto's world.
A great plot could involve the Nine - Tailed Fox being related to a powerful Fairy Tail spirit. So, when Naruto enters the Fairy Tail world, he has to figure out how to control this new connection. Also, what if the Sharingan was actually a form of lost Fairy Tail magic? A young Fairy Tail wizard could discover this and try to learn more about it from the Naruto characters. This would create a really interesting dynamic as they try to understand each other's powers and cultures.
A unique plot could be a story where the protagonist has both the Rinnegan and Jiongu and is hunted by different ninja clans who want to either steal the powers or destroy the one who has them out of fear. This could lead to a journey of self - discovery as the character tries to understand and master these powers while on the run. Maybe they end up forming an alliance with some unlikely allies to fight against their pursuers.
One idea could be that the descendant has to constantly hide their true nature from the villagers who fear the power of the Juubi. They might struggle to control the immense chakra within them and accidentally cause small disasters at first. Another plot could involve the descendant being hunted by an ancient organization that wants to use their connection to the Juubi for their own evil purposes.
I think Naruto would be really interesting. He's got his energetic and determined personality. In a fanfiction with Fairy Tail elements, he could learn all sorts of new magic and use his unique charm to make friends in the Fairy Tail world. His ability to never give up would be a great contrast to some of the more laid - back Fairy Tail characters.
One idea could be exploring the origin of the Ten - Tails in a different light. Maybe it was created by an ancient civilization for a noble purpose that got corrupted over time. Another could be a story where a young ninja discovers a hidden power within the Ten - Tails and has to learn to control it without being consumed by its dark energy.
One idea could be that the prodigy Anbu member has a unique ability that no one else in the Anbu has. For example, they can control the elements in a way that's different from normal ninja skills. This could lead to a plot where they are hunted by enemies who want to use this power for evil. Another idea is that the prodigy is secretly related to a major Naruto character, like Naruto himself, and this connection is gradually revealed as they face different challenges in the Anbu.
One idea could be that the mute prodigy has a unique form of ninjutsu that doesn't require speaking. Maybe they can use sign language to cast powerful jutsus. Another plot could involve the character being misunderstood because of their muteness, but gradually proving their worth. For example, in a mission, they use their silent skills to outwit the enemy.
Another plot could involve the Nara prodigy's relationships within the Naruto universe. For example, how they interact with Naruto and his friends. They could offer their strategic mind to help Naruto in a difficult mission, and through that, a deep friendship forms.
One idea could be that Merlin becomes king in a parallel universe where magic is the norm and rulers are chosen based on their magical abilities. He has to deal with a different set of rules and expectations compared to the original series. Another plot could be that Merlin is magically transported to a far - off land where he is recognized as a king due to his powers. He has to learn about this new land and its people while also facing threats from those who oppose his rule.
One unique plot idea could be that the character with red eyes has a special connection to the Darkness Dragon that gives them the power to control shadows in a way Naruto's regular jutsu can't. For example, they can use the dragon's power to create illusions within the shadows that are almost impossible to break. Another idea is that the red eyes are a sign of a long - lost clan related to the Darkness Dragon, and Naruto discovers he has some heritage from this clan, leading to a whole new set of powers and a journey to discover his clan's past. Also, perhaps the Darkness Dragon is sealed within Naruto and he has to learn to control its power without being consumed by the darkness it represents.
Perhaps in the fanfiction, the Zero Tails is a manifestation of the negative emotions of the ninja world as a whole. A group of young ninjas discover this and they try to find a way to purify the Zero Tails. They seek the help of old sages and learn ancient jutsu to attempt this purification, which could lead to a battle against those who want to keep the Zero Tails as a weapon of mass destruction.