One interesting plotline could be that Naruto's child has a special power that is both a blessing and a curse. Naruto, as a parent, has to help the child come to terms with this power, all while facing the challenges of the ninja community that may view this power with suspicion. He would need to use his own experiences and wisdom to guide his child through this difficult situation.
In this fanfiction, it could be that the single parent is a civilian in Konoha who has been through a lot. Naruto, who has always been about protecting the weak and those in need, crosses paths with them. The single parent's story of resilience and their love for their child touches Naruto deeply, and over time, they develop a relationship that ends in marriage.
A possible plotline is Naruto using his unorthodox methods to solve ANBU - related problems. His creativity and ability to think outside the box could lead to new strategies for the ANBU. He might come up with a new way to gather intelligence or take on a powerful enemy that the traditional ANBU methods couldn't handle.
One interesting plotline could be Naruto joining the Kumo village and having to adapt to their different ninja techniques and traditions. He might face challenges from the Kumo ninjas who are initially suspicious of him.
One possible plotline could be Naruto getting caught in a blizzard during a mission and suffering from hypothermia. His friends then have to race against time to find and warm him up. Maybe Sasuke uses his Sharingan to detect Naruto's chakra in the snowstorm.
One possible plotline could be Naruto being sent on a special mission to Kiri. He might encounter unique Kiri-nin and their special jutsus, and have to form unexpected alliances to complete his mission.
One interesting plotline could be the exploration of new jutsu by the characters. For example, Naruto might develop a unique jutsu that combines his Rasengan with some new element he discovers. Another could be the deepening of relationships between characters. Like Sasuke and Naruto's friendship reaching new levels of understanding. And there could also be a plotline where the hidden villages face a new, unexpected threat that forces them to work together in different ways than before.
In some 'naruto is king fanfiction', a great plotline is when Naruto uses his new - found 'kingship' to reform the shinobi education system. He could introduce new training methods that focus not only on combat but also on emotional intelligence and diplomacy, making the next generation of ninjas more well - rounded.
One interesting plotline could be the mizukage teaming up with Naruto to face a new and powerful enemy that threatens both the Hidden Mist and the Hidden Leaf villages. This would bring a fresh dynamic as they combine their unique skills and ninja techniques.
One interesting plotline could be Naruto using his unique experiences as a former student to develop new and unorthodox teaching methods. For example, he might incorporate his own journey of learning difficult jutsus into his lessons, making it more relatable for his students.
One interesting plotline could be Naruto developing new and unique jutsus in the shadows. For example, he might secretly master a jutsu that combines different elements in a way no one has seen before.