One idea could be Naruto being sent to the world of Death Note. He could use his ninja skills to try and outwit Light Yagami. Maybe he would initially be confused by the Death Note's power but then use his determination to stop Light from his killing spree. Another plot could involve Naruto meeting the Shinigami. He might learn about the balance between life and death in this new context and try to find a way to bring some of his ninja world's values to this strange new world.
A possible plot is that Naruto somehow gets a Death Note of his own. He has to grapple with the moral implications of using it. Since Naruto is all about protecting life, it would be a huge internal conflict for him. He could also team up with L to take down a common enemy who has also discovered the power of the Death Note in the Naruto universe. This would combine the detective work of L with Naruto's combat skills.
In a Naruto x Death fanfiction, the plot could revolve around Naruto's chakra being connected to the power of the Death Note. For example, his chakra could enhance the power of the Death Note or vice versa. This would attract the attention of both the ninja world and the world of Death Note. Characters from both universes would be forced to interact, leading to many interesting scenarios like Sasuke being interested in the power of the Death Note while Ryuk is curious about ninjutsu.
Well, a plot could involve Naruto faking his death as part of a training exercise that was actually set up by the older generation of ninja. They want to see how the new generation will react and grow without Naruto's presence. So Naruto goes along with it, but things get complicated when some of his friends start to suspect it's not real and go on a quest to find out the truth. Also, he could fake his death to test Hinata's loyalty or something like that, but that's a bit more of a soap - opera - like plot.
One idea could be that the death goddess has the power to bring back characters from the dead in the Naruto universe, but at a great cost. Maybe she offers Naruto this chance to revive his parents, but in return, he has to sacrifice some of his own chakra forever.
One plot idea could be Lady Death becoming an ally to Naruto during a particularly dark and dangerous mission. Maybe she has some unique powers that can help him defeat a powerful enemy. Another could be a story where Lady Death is sent to the Naruto universe to collect a soul, but she ends up getting involved in the complex politics of the ninja world. A third idea is that Lady Death takes on a human form in the Naruto world and becomes a ninja herself, with her own set of moral and ethical dilemmas as she tries to fit in while still having her otherworldly nature.
One idea could be that Lady Death appears in the Naruto universe during a major battle. Maybe she's there to claim the souls of the fallen, but Naruto, with his unwavering belief in life and his friends, tries to convince her to spare them. This could lead to an interesting dynamic where Naruto has to prove the value of life to a being who has seen so much death.
In naruto death battle fanfiction, a great plot idea could be a battle royale - style death battle involving Naruto and all of his major opponents throughout the series. Picture Naruto in the middle of a large arena, surrounded by Orochimaru, Pain, Madara, and others, all with their own motives and powers. It would be a chaotic and action - packed fight. Another idea could be a death battle where Naruto has lost his powers and has to rely solely on his ninja skills and strategic thinking. This would show a different side of him. Additionally, a plot where Naruto's death battle is against a powerful, mythical creature from the Naruto universe's lore would be very interesting.
One idea could be that Naruto and Kashuina meet during a mission outside of Konoha. They start off as rivals, constantly trying to outdo each other in combat skills. But as they face various challenges together, they gradually develop a mutual respect and then deeper feelings. Another plot could be set in a post - war scenario where Naruto, now a hero, meets Kashuina who has a unique ability to heal the psychological scars of the war - torn ninjas. Their interaction then leads to a romantic relationship. And a third idea is that they are both students under a new sensei who pairs them up for special training. During this training, they discover things about each other that they never knew before and fall in love.
Perhaps Naruto and Lala meet during a mission where Naruto is sent to a different dimension. Lala, being from an alien world, is intrigued by Naruto's determination and they form an alliance to face a common enemy in that dimension. Their different powers and abilities complement each other, and as they work together, they start to develop feelings for each other.
A more complex plot could be that there is a prophecy in both worlds about a union between someone from the Naruto universe and someone from Ruby's universe. Naruto and Ruby are the ones fated to fulfill this prophecy. They initially don't get along but as they face various challenges together, they start to understand each other and fall in love, while also saving both their worlds in the process.
In a naruto x avatar fanfiction, there could be a scenario where the Akatsuki from Naruto's world teams up with some of the villains from the Avatar world. This would force Naruto and the Avatar (whichever one it may be) to put aside their differences and form an alliance with other characters from both worlds to stop this powerful and evil coalition.
One idea could be that a zombie virus spreads in the Naruto world. Naruto and his friends have to not only fight the zombies but also figure out how the virus started. Maybe Orochimaru was experimenting with dark jutsu and it went wrong.