Kakashi's jutsu like the Chidori, which is a powerful lightning - based attack, might interact strangely with the magic in the Harry Potter world. For example, it could disrupt spells if used in close proximity. On the other hand, Harry's magic could potentially be used to enhance Kakashi's jutsu, like using a spell to increase the speed or power of the Chidori.
Naruto might be initially excited. He's always eager to learn new and powerful jutsu, and the Chidori is a very cool and strong one. He probably can't wait to start training and show off to his friends once he masters it.
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.
The main signs and symbols in 'Signs and Symbols' short story can be diverse. There could be symbols related to nature, like a withering flower which might symbolize the decay of hope or the transience of beauty. The actions of the characters can also be signs. For instance, if a character is constantly looking out of the window, it could be a sign of their longing for something outside their current situation, perhaps a symbol of their search for meaning or a way out of their problems.
There's also the 'Inferno Storm Jutsu' in some fanfictions. It creates a large - scale storm made entirely of fire. The fire in this storm has different intensities, with the center being the hottest and most destructive. It can cover a large area, making it a great offensive move against groups of enemies.
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.