One common plot point is that Naruto's sickness becomes a threat to the village. Since he's often seen as a protector, his being incapacitated can make the village vulnerable. Another is the way his friends react. They usually band together to support him, like Sasuke might return to the village out of concern for Naruto's health. Also, the search for a cure can be a big part of the plot. It could involve seeking out rare herbs or consulting with ancient medical ninjas.
One common theme is the mentor - mentee relationship. Tsunade, being an experienced ninja and one of the Sannin, often takes Naruto under her wing in fanfictions. She can teach him things like better chakra control or more advanced combat techniques. Another theme is the exploration of their past traumas. Both have faced significant losses in their lives, and fanfictions may delve into how they can heal each other. For example, Naruto can help Tsunade move past the deaths of Dan and Nawaki, while Tsunade can offer Naruto wisdom on dealing with the absence of his parents.
Another common theme is growth. Naruto and Hinata both grow as individuals and as a couple. In many fanfictions, they face challenges that help them become stronger. Like they might face a powerful enemy that forces them to improve their skills while also strengthening their bond.
In many Naruto Shippuden fanfictions where Naruto gets sick, it often shows a different side of his character. Usually, his friends like Sakura and Kakashi would be very worried. Sakura might use her medical skills to take care of him. And his enemies might take this opportunity to try and attack. But Naruto's strong will would still be there even when he's sick. He might not be able to fight as powerfully, but his determination to protect the village would remain unshaken. This kind of fanfiction can explore the relationships in the Naruto universe more deeply when the main character is in a vulnerable state.
One common plotline is that Naruto's friends take care of him. For example, Sakura might use her medical skills to nurse him back to health. Another could be Naruto having flashbacks or deep thoughts while sick, perhaps about his lonely childhood. And sometimes, enemies might take advantage of his weakened state, leading to some tense situations where his friends have to protect him.
One common plot point is that Lincoln's sisters panic at first. They're not used to him being so vulnerable. Another is that they all try to use their own skills to help. Like Lisa with her scientific knowledge trying to diagnose him accurately.
One common plot point is Naruto learning medical jutsu from an experienced medical ninja, perhaps Tsunade. Another is him using his medical skills to save his friends in unexpected situations during battles.
One interesting plot point could be the discovery of new jutsu on the forgotten island. Maybe Naruto and his friends find a unique form of chakra manipulation that is specific to that place.
Often, the special sword in Naruto fanfictions is a source of conflict. Enemies might be after the sword for its power. Naruto has to not only protect the sword but also figure out how to use it to its full potential. Sometimes, the sword can transform into different forms, like a larger two - handed sword or a smaller dagger for stealth attacks. This transformation ability adds an extra layer of complexity to the story and Naruto's battles, as he has to adapt his fighting style accordingly.
One common plot point is the secrecy itself. There are often elaborate schemes to keep the marriage under wraps from Naruto's friends and the village elders. Another is the discovery of the marriage, which can lead to a whole range of reactions from shock to acceptance.
Well, there are fanfictions that imagine Kankuro in alternate universes. In one, he could be in a world where puppets are sentient beings and he has to deal with the ethical and moral implications of using them. Another might be a story where he is part of a traveling circus troupe that uses puppets in their shows, and he has to use his skills to protect the troupe from bandits. There could also be a fanfic where Kankuro is the main character in a love story, perhaps with a character from another village.