One interesting plot could be that Naruto is somehow transported to the underworld. He meets various underworld characters and tries to use his ninja skills to survive. Maybe he has to fight against underworld demons using his shadow clones and rasengan. He could also try to find a way back to his own world while learning about the power dynamics in the underworld.
Well, consider this. The underworld has a prophecy about a 'foreign' hero who will come and save them from an impending doom. Naruto, unknowingly, fits this prophecy. He arrives in the underworld and at first is seen as an intruder. But as he shows his skills and good heart, the underworld creatures start to trust him. He then has to battle against a huge, shadowy entity that is draining the life force of the underworld. Using his chakra and ninja wisdom, he tries to defeat this entity and restore balance to the underworld.
A possible plot is that the underworld is in chaos due to a powerful and evil force. Naruto, being the hero he is, is called upon to help. He teams up with some of the more benevolent underworld beings. They face challenges like navigating through different levels of the underworld, each with its own set of rules and hazards. Naruto's positive attitude starts to influence the underworld, bringing a glimmer of hope to the otherwise dark place.
Well, a plot could involve the Akatsuki somehow making a deal with an underworld lord. Naruto discovers this and tries to stop it. He teams up with some unexpected allies from the underworld who also oppose the Akatsuki's actions. Along the way, Naruto has to learn about the unique powers and rules of the underworld to be successful in his mission.
Naruto's powers would likely be seen as very strange and powerful in the underworld. His ability to create shadow clones might be mistaken for some sort of dark magic at first. His rasengan, a powerful and concentrated ball of chakra, would be seen as a formidable weapon. The underworld beings, who may be used to different forms of magic and power, would either be in awe or fear of Naruto's abilities.
One possible plot could be that Naruto is somehow transported to the underworld. There, he meets a powerful underworld character who has a grudge against Konoha. But Naruto, with his determination, tries to make peace. Along the way, he discovers a new form of chakra related to the underworld's energy. And as for the 'lemon' aspect, perhaps there could be a budding romance between Naruto and a female underworld dweller where they share some tender, romantic moments.
One possible plot could be that a powerful villain from the Naruto universe somehow gains the ability to take over the bodies of Fairy Tail mages. This would lead to a race against time for Naruto characters like Naruto and Sasuke, along with Fairy Tail members like Natsu and Lucy, to find a way to stop this takeover. They would have to combine their different types of magic and ninja skills to combat this new threat.
A possible interesting plot could be that a powerful villain is trying to merge the two worlds, Fairy Tail's world and Naruto's world, into one chaotic mess. Lucy and Naruto are brought together by fate to stop this. They start off not trusting each other much as they are from very different backgrounds. But as they face challenges together, like battling the villain's minions who have a mix of magic and ninjutsu abilities, they begin to respect and rely on each other. Eventually, they discover that the key to stopping the villain lies in combining Lucy's celestial magic with Naruto's Sage Mode powers.
An interesting plot could be that Anko discovers a hidden ability within Naruto that not even he was aware of. It could be related to an ancient ninja art that has some connection to Anko's family. They then go on a quest to learn more about this ability. Along the way, they face various challenges, like traps set by an unknown enemy who doesn't want them to uncover the secrets of this power. As they progress, they also have to deal with their own personal demons. Naruto has to overcome his fear of not being in control of this new power, and Anko has to face her past traumas related to Orochimaru that resurface during the journey.
One possible plot could be that the Juubi somehow gets transported to the Naruto world during a strange rift in space - time. Naruto and his friends have to figure out how to deal with this powerful and chaotic entity. They might initially try to fight it, but then realize they need to find a way to seal it again, like they did with the other tailed beasts. This could lead to new alliances and power - ups for the characters as they struggle to protect their world.
A common plot twist is when a Naruto teacher is suddenly made to teach a group of students who are not ninjas at all. For instance, if Kakashi has to teach normal high - school students in a non - ninja world. It completely changes his teaching approach and the dynamic of the story.
A cool plot could be that the Sage of Six Paths in Naruto's world had a connection to Skyrim long ago. When Naruto unlocks some hidden power within himself, it accidentally triggers a link to Skyrim. Once in Skyrim, he discovers that his chakra is linked to the dragon shouts. He has to go on a quest to learn more about this connection. He meets the mages in the College of Winterhold, who are fascinated by his chakra abilities. Together, they try to figure out a way to use Naruto's power to stop a great evil that is threatening both Skyrim and, through the link, Naruto's own world.
One possible plot could be that the Avengers are somehow transported to the Naruto universe. They team up with Naruto and his friends to fight a common enemy like Kaguya who has somehow obtained the Infinity Stones. The Avengers' powers and technology would be a huge shock to the Naruto world, and they'd have to learn to combine their skills to succeed.