A cool plot could involve Naruto himself getting an ability similar to All for One. He could struggle with the morality of using such a power that takes abilities from others. He might initially use it to stop powerful villains but then face opposition from his friends who fear he's becoming too much like the enemies he fights.
One plot idea could be a character from the All for One world somehow ending up in the Naruto universe and having to adapt to the chakra system. Maybe they try to steal chakra powers like they steal quirks in their own world.
Perhaps a fanfic could center around a group of Naruto characters who discover an ancient jutsu that has the same effect as All for One. They then have to decide what to do with this power. Do they keep it a secret? Or do they try to use it for the greater good? There could be a lot of internal conflict within the group as they debate the ethics of this powerful jutsu.
Perhaps in the fanfic, the One for All quirk could be linked to Naruto's Nine - Tails chakra. The two powerful forces could either clash or merge, creating a completely new power dynamic within Naruto. This could also cause internal struggles for Naruto as he tries to control both the wild nature of the Nine - Tails and the unique properties of One for All.
One idea could be a crossover where Naruto's world is invaded by villains from Hero Academia led by All for One. Naruto and his friends team up with the heroes from Hero Academia to fight back. They could learn new techniques from each other, like the heroes learning chakra control from Naruto.
One idea could be a character having the 'All For One' quirk in the Naruto universe and using it to steal other ninja's unique abilities. For example, they might target a Sharingan user to gain that power. Another plot could involve a group trying to stop this 'All For One' - like - character from disrupting the balance of power in the ninja world. And perhaps the character with 'All For One' has a hidden motive related to an ancient prophecy in the Naruto world.
Well, a really cool plot might be that Orochimaru, always interested in new powers, somehow gets his hands on the 'All for One' concept. He could start using it to assimilate the powers of different beasts, like the tailed beasts, in a new and different way than just sealing them. Or perhaps a young genin discovers they have the 'All for One' ability. They initially use it to help their friends by taking on some of their weaknesses, but then it attracts the wrong kind of attention from the Akatsuki, who see it as a powerful tool for their own goals. Also, a time - travel plot where a character from the future with the 'All for One' ability comes back to the Naruto world to change the course of history, either for good or bad.
An interesting plot idea for Naruto fanfic might be to focus on the life of a minor character. For instance, what if we told the story of a genin who never made it to be a chunin but still had a significant impact on the village in some other way? Or a story where all the ninja abilities are suddenly switched among the characters, and they have to adapt to these new powers while still facing their usual enemies. This could lead to some really fun and unexpected character interactions.
A 'naruto all elements fanfic' could center around Naruto being cursed with an imbalance of all the elements within him. He has to find a way to control and harmonize them, perhaps with the help of an ancient sage who once mastered all elements. This could lead to new and powerful jutsu development.
One plot idea could be that Naruto, with his masochist tendencies, volunteers for Anko's extremely tough training regime. Anko is initially puzzled by Naruto's eagerness to endure such harsh training but soon realizes that it's part of his unique personality. As they train together, they start to understand each other better and form a strong bond of friendship. Naruto's masochist nature actually helps him progress faster in the training, and Anko begins to respect his determination.
One idea could be that Naruto and Saitama somehow end up in a shared dimension where they have to team up to defeat a common enemy. For example, a powerful demon from Naruto's world that has the ability to regenerate like some of the monsters in One Punch Man's world. Another plot could involve Naruto learning Saitama's training regime and trying to incorporate it into his own ninja training, while Saitama is intrigued by Naruto's chakra system and tries to figure out if he can use it to make his punches even more powerful.
One idea could be that Naruto discovers a hidden power within Shenron. For example, instead of just granting wishes in the traditional way, Shenron could offer Naruto a special training regime that enhances his already powerful jutsu. This could lead to Naruto facing new and even stronger enemies.
Another plot could be Samui getting involved in a time - travel adventure. Maybe she gets sent back in time to the era when the ninja world was just being formed. She then has to use her modern - day knowledge and skills to survive in that primitive yet dangerous time, and also has the chance to change the course of ninja history in small ways.