Sure. There could be a fanfiction with such a plot. Naruto is known for his ability to form unique bonds. If he were to sign a lion summoning contract, it would be interesting. The lions could have their own personalities and abilities. For example, they might be able to use fire - based attacks or have super - speed, which would add a new dimension to Naruto's fighting style.
Well, in this fanfiction, Naruto might gain some unique powers. Maybe he could communicate with the fox in a special way, like having telepathic conversations. This could lead to him having an edge in battles as he could quickly call upon the fox's strength.
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.
His combat abilities would be different. He could use the fox's abilities more directly. For example, he might be able to summon fox - like illusions to confuse his 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.
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.
He could practice in secret locations where no one can see him. For example, in an abandoned cave or a hidden part of the forest. That way, no one will know about the new jutsu he's developing.