Well, 'Naruto: The Mysterious Mentor' is really good. Here, Naruto meets a mysterious figure who teaches him skills that no one else in the ninja world knows. 'Naruto's Parallel World' is also interesting. It shows what would happen if Naruto lived in a parallel world with different rules and relationships. And 'Naruto: The Dragon Summoner' where Naruto discovers he has the ability to summon dragons, which is a very exciting twist on the original story.
One great Naruto fanfiction is 'A New Path'. It takes an interesting turn on the story by having Naruto discover a new form of chakra. Another one is 'Naruto's Hidden Power' which delves deep into Naruto's potential that was not fully explored in the original series. And 'Team 7: Reborn' is also a popular one where the team gets a second chance at their journey, with new challenges and character developments.
It could be about Naruto finally letting go of Kurama in a very emotional way. Maybe it shows his journey of coming to terms with the loss, and how it changes his relationship with the other villagers.
Obviously, Naruto is the main character as he is the one releasing the Kyuubi. Sasuke could also be involved, perhaps as an ally or an antagonist depending on the plot of the fanfiction. Sakura might be there too, trying to support Naruto in controlling the Kyuubi's power or dealing with the aftermath.
One interesting scenario could be Naruto learning to control the Kyuubi's power in a unique way that wasn't shown in the original series. For example, he might use it to create new jutsu that combine his own skills with the Kyuubi's raw power.
Well, in fanfiction when Naruto releases his power, it could result in some wild and creative scenarios. He could end up using his power to explore new dimensions or time - travel. His power might also attract the attention of ancient and powerful entities. Imagine Naruto using his power to communicate with the spirits of past Hokages in a more profound way, getting advice and unlocking even greater powers from their wisdom.
It could make the plot more focused on Naruto's internal growth as he no longer has Kurama's power. He has to rely more on his own skills and the bonds he has formed with his friends.
In some fanfictions, the immediate consequence could be destruction. Buildings might be razed and many shinobi could be injured or killed. The village would be in chaos as they try to either contain Naruto or the Kyuubi's power. There could also be a shift in the power dynamics, with some seeing Naruto as a threat and others trying to find a way to calm him down and reseal the Kyuubi.
Well, in this fanfiction, when Naruto releases the Kyuubi fuuinjutsu, it could completely change the power dynamics in the Naruto universe. His friends might be both in awe and a bit scared of his newfound strength. Naruto would have to learn to control this power quickly, or it could end up causing more harm than good. He might also face new challenges as other villages view him as an even greater threat now.
One popular Naruto fanfiction related to lightning could be those that focus on a character with a lightning - based chakra nature developing new and powerful jutsus. For example, a story where Sasuke further explores his lightning - style techniques and creates unique combinations.