He could create a jutsu that allows him to teleport short distances. Given his quick thinking and need for mobility in battles, a short - range teleportation jutsu would be very useful. It could be like a mini - version of Kamui but powered by his own chakra.
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.
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.
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.
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.
The most exciting part is seeing new powers. For example, when Naruto gets a new jutsu, it could be something that completely changes the way he fights. It's like getting a new superpower.
He might also draw inspiration from his friends' jutsus. Sasuke has some powerful fire - based jutsus. Naruto could think about how to counter or incorporate those elements. He could try to merge his own wind - style with Sasuke's fire to create a new type of jutsu that has both the intensity of fire and the cutting power of wind.
One possible new jutsu could be a healing jutsu using Quincy powers. Quincy have a connection to spiritual energy which could potentially be used for healing. Naruto, with his big heart and desire to protect, would surely find a way to use this to heal his friends or even himself during battle. He could also create a jutsu that imbues his shadow clones with Quincy powers, making them more effective in combat and able to perform tasks that normal shadow clones couldn't.
Well, there's a fanfiction called 'Naruto's Elemental Jutsu Evolution'. It's about Naruto finding a way to evolve his basic elemental jutsus into something more powerful. And 'The Mysterious New Jutsu' is also quite interesting. In it, Naruto is taught a new jutsu by a mysterious shinobi who appears in the Hidden Leaf Village.