One interesting plot could be a new character who has a unique jutsu that challenges Naruto's skills. This new character might come from a far - off land and have a different understanding of the ninja way.
He has trouble moving around. Without sight, he can't easily navigate the village or the forest. He might constantly bump into things. Also, in combat, he can't see his opponents' attacks coming. It's a huge disadvantage compared to when he could see.
One interesting masked ninja is Shinji. He is a masked character in fanfiction who was once a normal ninja but got cursed by an ancient evil. Now, with his masked identity, he tries to find a way to break the curse while also using his new - found dark powers for good in the Naruto world. There's also a masked ninja named Yuki. Yuki is a snow - style user and her mask is made of ice crystals. She is on a quest to find the origin of her ice - based powers. Another is Hikaru, a masked ninja with the power of light, who is often at odds with the darker elements in the Naruto fanfiction world.
It could be a former Leaf Village ninja who left due to some sort of disagreement. Maybe someone who didn't agree with the village's leadership or its way of training young ninjas.
One possible fanfiction could be about a Naruto ninja who has a special mouth technique. Maybe it allows him to speak different languages and he uses this ability to communicate with various enemies and allies during a mission. He could be on a quest to find an ancient scroll that holds the secrets to enhancing his mouth - related jutsu.
One popular plot idea is a masked ninja being a long - lost relative of a main character. For example, they could be related to Naruto and have been in hiding all this time. Another idea is a masked ninja being a spy from another village, with a complex backstory of loyalty and betrayal. Also, there could be a masked ninja who is a time - traveler, coming from the future to change key events in the Naruto universe.
His taijutsu might be more refined. Rin, having trained with Kakashi and Obito, could pass on some unique close - combat techniques. Naruto might also have a better understanding of chakra control from an earlier age. Since Rin was good at medical ninjutsu, Naruto could potentially combine that with his own chakra - based attacks in creative ways.
No. Most Naruto fanfics tend to focus on more positive aspects like Naruto's growth, his relationships, or new adventures. A 'torture ninja' concept is quite dark and goes against the general spirit of the Naruto series, so it's not likely to be common.
Naruto's shadow clone jutsu can be used for multitasking in accounting. He can send clones to different departments to collect financial data all at once. This would speed up the accounting process significantly.