A 'Solar - Flare Rasengan'. Naruto could combine his wind - style chakra with some kind of solar - based energy he discovers. This jutsu would be like a super - charged Rasengan that emits a blinding light as well as powerful wind - based damage.
There could be a jutsu that allows for instant teleportation across long distances. This jutsu might be a new discovery in the fanfiction world, perhaps created by a character who has been experimenting with space - time ninjutsu. They might use it to quickly get in and out of battles or reach far - off places in a blink.
It could be a new form of Rasengan. Maybe Naruto discovers a way to combine different elements with the Rasengan more effectively, like adding lightning to it for a more powerful and faster attack.
Often, Sakura is depicted as kind - hearted. She is the one who is more likely to see the good in people. Karin, on the other hand, might be more headstrong. For example, when they face a difficult situation, Sakura will try to find a peaceful solution first, while Karin is ready to jump into action right away.
In the Naruto saves Karin fanfic, the act of saving Karin by Naruto can have a profound impact on their relationship. Karin has always been on the periphery of Naruto's world, but this event would bring her closer. She may start to believe in Naruto's ideology more strongly. Naruto would also develop a more protective stance towards Karin. This new dynamic could lead to more interactions between them in the future, both in battle and in more personal, emotional situations.
Some popular themes could be love and friendship. In fanfiction, the relationship between Kazune and Karin can be explored in terms of how they support each other. For example, their adventures together might strengthen their bond. Another theme could be self - discovery. As they face various challenges in the fan - created stories, they might learn more about themselves and their powers. Also, themes of family can be present as they interact with other characters who are like family to them.
Maybe Sasuke. Although they are rivals, they also have a deep bond. Sasuke might have come across a unique jutsu during his travels and decide to teach it to Naruto so that they can both become stronger and better protect their village.
It could be Naruto himself who discovers and uses the Katon Hijingakure no Jutsu in the fanfiction. Since he's always exploring new jutsus and pushing his limits.
He might learn a time - traveling jutsu. This would be really cool as it could allow him to go back and change certain events in the Naruto world, or gain knowledge from the past to use in the present battles.
Sure, Karin is featured in the Boruto manga. Her role may not be as prominent as in some other arcs, but she's there contributing to the overall narrative.