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.
One interesting Naruto and Lala fanfiction could be where Lala uses her alien technology to help Naruto in his battles. For example, she might create some high - tech weapons for him that give him an edge against his foes. Another could be a story where Naruto teaches Lala about the ninja way and she in turn shows him some of her Devilukean culture.
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.
A possible plot could involve Kefla being sent to the Naruto world as part of a test by the Kais. In this world, she is intrigued by Naruto's determination. Naruto, on the other hand, is amazed by her power. They train together and learn from each other's fighting styles. This leads to a strong bond between them, and they end up protecting the Hidden Leaf Village from a powerful new threat.
One idea could be that the clone develops its own unique personality over time and forms a special bond with Naruto that is different from his relationship with others. It could start to have dreams and desires separate from its original purpose as a clone.
One plot idea could be that Naruto, using his unique ability to understand and reach out to others, tries to find a way to redeem Kaguya. He might journey through different dimensions to learn more about her past and what led her to become so power - hungry. This could involve him facing challenges in these strange dimensions and having to rely on his ninja skills as well as his compassion.
One idea could be that Naruto discovers a hidden power within himself related to Amaterasu. Maybe during a battle, he accidentally taps into it and has to learn to control this new, unexpected ability. It could be a power passed down through some ancient connection in his family.
In Naruto x Sarada fanfiction, a possible plot is that there is a new threat to the Leaf Village that only their combined skills can defeat. Sarada's intelligence and Sharingan abilities combined with Naruto's vast chakra reserves and Rasengan techniques could make for an exciting battle. Also, it could be interesting if they have to infiltrate an enemy stronghold where they need to rely on each other completely, and in the process, Sarada learns more about Naruto's past and what made him the Hokage.
One idea could be that Naruto and Ryuzetsu meet during a mission in a hidden land. Ryuzetsu is initially suspicious of Naruto but as they face challenges together, she begins to see his kind heart. Another could be a story where Ryuzetsu has to protect Naruto from an unknown enemy and in the process, they develop a deep bond. Or perhaps a plot where they accidentally end up in a parallel dimension together and have to find their way back while relying on each other.