Well, in a 'Naruto learns nen' fanfiction, perhaps Naruto is sent to a different dimension where nen is the dominant power source. There, he has to learn nen to survive and find his way back home. He starts from the basics, learning about the different nen types like Enhancer, Transmuter etc. As he progresses, he combines his knowledge of ninjutsu with nen, creating unique and powerful attacks.
A traveling nen master could be Naruto's mentor. This master could be on a journey to spread the knowledge of nen. He crosses paths with Naruto and decides to teach him. The master might have a strict teaching style, pushing Naruto to his limits, but also guiding him carefully through the complex world of nen.
In a 'harry potter learns nen fanfic', it could be that during his time at Hogwarts, a new exchange student from a far - off land where nen is known arrives. This student becomes friends with Harry and teaches him about nen. Harry then tries to combine nen with his existing magical abilities, like using nen to make his Patronus more powerful.
Perhaps in this fanfiction, Naruto is born with the ability to use Nen, but it lies dormant until he faces a great danger. When it awakens, he has to learn to control it quickly. He might struggle at first, as Nen is very different from chakra. But with the help of his friends and his own determination, he masters Nen and uses it to protect Konoha from a new and unexpected threat that normal ninja techniques can't handle.
Well, it could start with Naruto being born female in this fanfiction universe. As she grows up, she discovers the power of Nen. Maybe she goes on a journey to learn more about it, facing challenges along the way similar to those in the Naruto world but with the added element of Nen. For instance, she might have to use Nen to defeat enemies that the normal Naruto - style jutsu can't handle.
It could be Hagrid. He's always had a connection to strange and powerful things. Maybe he stumbles upon the knowledge of nen during one of his trips in the magical forest and then passes it on to Harry.
In a 'naruto learns kenjutsu fanfiction', one possible plot could be that Naruto decides to learn kenjutsu to diversify his combat skills. He might seek out a master swordsman in a hidden village. The master could initially be reluctant to teach him, seeing Naruto as a rowdy ninja. But as Naruto shows his determination and unique ninja way, the master changes his mind. Naruto then has to go through rigorous training, learning different sword stances and techniques. Along the way, he might face opponents who are skilled in kenjutsu and use those battles to improve his skills further.
Well, one possibility is that Naruto learns hypnosis from a mysterious ninja. This new skill helps him in battles by confusing his opponents. He could use it to make enemies see illusions of multiple Narutos, giving him an edge in combat.
The fanfiction might be about Naruto accidentally stumbling upon a ancient scroll that contains the secrets of bending. He decides to learn it out of curiosity. He begins with fire bending, which is a challenge as it's very different from his chakra - based fire techniques. But with his ninja training and unwavering will, he manages to figure out how to control the flames in the new way of bending.
Well, one possible plot could be that Naruto travels to a foreign land where Muay Thai is popular. He meets a tough Muay Thai master who initially doubts Naruto's abilities but is soon impressed by his determination. Naruto then starts training rigorously, facing challenges like learning the unique stances and powerful kicks of Muay Thai. As he progresses, he combines his ninja skills with Muay Thai techniques, creating a new and formidable fighting style.
Well, one possibility is that Naruto discovers the lost taijutsu in an ancient scroll. Maybe it was hidden away by a long - gone ninja clan. He then has to figure out how to master it with his own unique style, like combining it with his shadow clone jutsu to practice multiple moves at once.