One idea could be that Naruto saves Shizuka from a dangerous situation, like a group of bandits. This heroic act makes Shizuka see Naruto in a new light and sparks the beginning of their romance. Another could be that they are paired up for a mission that requires them to pretend to be a couple, and during this time, real feelings start to develop.
Maybe there's a time - traveling plot where Korra gets sent back in time to Naruto's era. She has to adapt to the different ways there, and Naruto helps her. Along the way, they are intrigued by each other's powers and personalities. They go on adventures together, facing challenges side by side, which leads to a romantic connection.
One interesting plot could be that Naruto and Shizuka go on a journey together to discover a hidden ninja art. Along the way, they face various challenges and their relationship deepens as they rely on each other for survival.
A plot idea could be that Naruto discovers a new, ancient form of chakra that has been lost for centuries. He then has to train to master this chakra while also dealing with the political implications within the Hidden Leaf Village. Some elders might be against him exploring this new power for fear of the unknown, but Naruto, being Naruto, is determined to master it for the good of the village.
One idea could be that the events of 9/11 somehow influence the Hidden Leaf Village. For example, they might tighten security and Naruto could be part of a new team in charge of protecting the village from potential outside threats inspired by the real - world event. Another plot could involve characters from Naruto trying to understand the concept of such a large - scale tragedy and how they can prevent similar things in their own world.
Perhaps a romance between a ninja from a different village and a Naruto clone. They meet during a battle in the Clone Wars and initially see each other as enemies. But as they interact more, they start to have feelings for each other. They then have to face the challenges of being from opposing sides while also dealing with the chaos of the war.
One idea could be that Naruto is somehow transported to the world of Rias Gremory. He, with his strong sense of justice and determination, catches Rias's eye. They start off as friends, training together. As they spend more time, they realize their feelings for each other. Naruto's unique powers also intrigue the other devils in Rias's peerage.
One idea could be that Naruto, in a strange new world, meets Chifuyu. They start off as strangers but are drawn to each other because of their shared sense of justice. Naruto's positive attitude slowly breaks down Chifuyu's more guarded exterior, and they embark on adventures together, facing various threats and in the process, falling in love.
One idea could be that Naruto, through some magical or interdimensional event, ends up in the world of Highschool DxD. He could use his ninja skills and kind heart to win over one of the female characters, like Rias. Maybe he helps her with some underworld threats using his shadow clone jutsu, and in the process, a romantic bond forms between them.
One interesting plot idea could be a time - travel story. For example, Naruto is sent back in time to the era of the First Hokage. He could use his knowledge of future jutsu and events to change things for the better in the past. Another idea is a story where Naruto discovers a hidden clan within Konoha that has a unique and powerful Kekkei Genkai. He then has to help this clan gain acceptance in the village. A third idea might be a story where Naruto is turned into a different creature, like a cat or a fox, and has to find a way to turn back while still dealing with the normal threats to the village.
One idea could be that Neji discovers a new hidden power within Naruto that he helps Naruto master. This could lead to them having to face a new, powerful enemy together.