To create a jutsu in Naruto Jutsu Maker Fanfic, look at the existing jutsus for inspiration. Notice how they are named, what they do, and how they are used in battles. You could base your new jutsu on a character's personality or backstory. If your character has a connection to water, like growing up near a big lake, maybe the jutsu involves creating huge water serpents. Another aspect is the chakra consumption. Decide how much chakra your jutsu will use. If it's a very powerful jutsu, it should probably consume a lot of chakra, but you can also create some low - chakra - cost jutsus for quick and repeated use.
One key feature is the authenticity to the Naruto universe. Make sure your created jutsus fit within the established rules of chakra, elements, and hand signs. Another is creativity. You don't want to just copy existing jutsus but come up with something new and exciting. Also, consider the balance. A jutsu that is too overpowered can make the story uninteresting as there's no real challenge. And if it's too weak, it won't be impactful.
They could study ancient scrolls. In the Naruto world, there are often hidden scrolls with powerful jutsu. A character might stumble upon one that has the secrets of a new space - time jutsu. By deciphering the symbols and practicing the techniques described, they could develop the new jutsu.
One idea could be Naruto discovers an ancient scroll that details the Mokujin no Jutsu. He then tries to master it in secret to surprise his friends. As he practices, he realizes it has a connection to the forest spirits and he has to earn their trust to fully utilize the jutsu.
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.
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.
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.
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.
He could potentially learn the Flying Thunder God Technique. It's a very powerful jutsu that Minato was famous for. Naruto's already fast with his Sage Mode and Nine - Tails Chakra, and this would make him even more formidable in battle.