A plot could revolve around Naruto teaching the Katon Gouka Mekkyaku to a new generation of ninja. This could show his growth as a teacher and how he adapts the technique for different learning styles among the young ninja. He might also have to face some challenges when some of the students misuse the technique at first.
Perhaps in a fanfiction, the Katon Gouka Mekkyaku is the key to unlocking a long - forgotten prophecy. Naruto, along with his friends, has to go on a quest to understand the full meaning of the technique in relation to the prophecy. They face various enemies and obstacles along the way, all while trying to master and utilize the Katon Gouka Mekkyaku to its fullest potential.
Well, the plot could involve Naruto exploring new ways to use the Katon Gouka Mekkyaku. Maybe he's in a battle against a powerful enemy who has some sort of resistance to fire techniques. So, Naruto has to combine it with other jutsus or find a new way to channel the chakra for this technique to make it more effective. He could also be teaching the technique to some of the younger ninjas in Konoha, which would lead to some interesting training scenes and character development for those new ninjas.
It could be used as a form of communication. For example, Naruto could use different intensities and patterns of the Katon Gouka Mekkyaku to send messages across long distances. This would be a very unique application compared to its normal use as an offensive technique.
They could use it in battles. For example, a character might use the Katon Gouka Mekkyaku to break through an enemy's defense made of earth jutsus. The intense heat of the fire would melt the earth and create an opening for an attack. Another way is for characters to modify the technique. Maybe they add some wind chakra to make the fire spread faster or be more concentrated in one area.
One plot idea could be Naruto's journey to master the Katon techniques. He might start with basic Katon jutsus and struggle to control the fire at first. For example, accidentally setting things on fire in the village while training. Another idea is that he discovers a new, powerful Katon technique that was lost in history and has to face off against enemies who also want to obtain it. Maybe he teams up with Sasuke, who has his own fire - related abilities, and they combine their powers in an epic battle.
A plot could be that a succubus is sent to the Naruto universe as part of a deal between dark forces. She targets Naruto because of his growing power. But as she gets closer to him, she starts to feel real emotions for him instead of just using him for power. This creates a conflict within her as she has to choose between her original mission and her new - found feelings.
One idea could be a crossover where a character with ice - make abilities from Fairy Tail ends up in the Naruto universe. They could use their ice - make skills to help the Naruto characters in battles, like creating ice barriers to protect the Hidden Leaf Village from an attack. Another plot could involve a Naruto character discovering they have an ice - make - like kekkei genkai and has to learn to control it while facing challenges from enemies who fear this new power.
Perhaps a magical creature mistakes Naruto for its long - lost love who was known for being extremely charming. As a result, the creature bestows upon Naruto a temporary transformation that makes him sexy. This could lead to humorous situations where Naruto is confused by all the new attention he's getting. He might accidentally use this new - found allure to his advantage during a battle, distracting his opponents with his looks while also using his regular ninja skills.
One idea could be that King Kong is somehow transported to the Naruto universe. He could be mistaken for a giant summon at first. Then, Naruto, with his friendly nature, tries to communicate with King Kong. Maybe they team up against a common enemy like a powerful new Akatsuki member who has the ability to control large beasts.
A Naruto and Shuri fanfiction could also focus on a training arc. Imagine Shuri wanting to learn some of Naruto's ninja skills, like how to move stealthily or how to use kunai effectively. Naruto, on the other hand, could be interested in learning about Wakandan science and technology from Shuri. They could train together in the Wakandan forests, with Naruto teaching Shuri basic ninja moves and Shuri teaching Naruto about the latest Wakandan inventions. This cross - training would not only strengthen their individual abilities but also create a deep bond between them.
One idea could be Naruto and his friends go on a mission during Halloween in a spooky forest. They encounter strange creatures that are actually the result of a jutsu gone wrong. Another could be that the Hidden Leaf Village holds a Halloween - themed ninja competition where they have to use their skills in a haunted - like setting. Or perhaps Naruto wakes up to find the village has been transformed into a Halloween - like world and he has to figure out how to reverse it.