Hyourinmaru could be a part of a prophecy. A seer in the Naruto fanfiction could predict that a weapon like Hyourinmaru will appear and the one who wields it will either save or destroy the ninja world. This would set off a race among different characters to either find and protect it or find and destroy it before it falls into the wrong hands.
Hyourinmaru could be a key to unlocking a hidden power within a character. For instance, a young ninja discovers an old scroll that mentions Hyourinmaru. As they study it, they find that it holds the secret to a new form of chakra control related to ice. This then gives them an edge in combat and in their journey to become a stronger ninja.
One possible plot could be that Naruto somehow ends up in the Soul Society. There, he discovers Hyourinmaru. Maybe through some strange magic or accident, he forms a bond with it. He then has to learn to control Hyourinmaru's powers, which are very different from his chakra - based powers. He might face challenges from the Soul Reapers who initially don't trust him with such a powerful zanpakuto.
He could play the role of a disruptor. Just like his character in his own universe, he would disrupt the existing power dynamics in Naruto. His overpowered abilities would make him a force to be reckoned with, whether he's on the side of good or bad.
One unique feature is the character development. In 'naruto hyourinmaru fanfiction', Naruto often has to adapt to new situations involving Hyourinmaru. This forces him to grow in ways not seen in the original Naruto story. Also, Hyourinmaru's presence can change the power dynamics in battles and relationships within the Naruto universe. For example, it can introduce new forms of combat and cooperation that are not part of the normal Naruto lore. This makes for very interesting reading as it expands on the existing Naruto world in unexpected ways.
In the fanfiction, Naruto's immortality could make him a key figure in resolving long - standing conflicts. He has the time and the power to study both the wizarding and ninja worlds deeply. So he could use his knowledge to find solutions to problems that have been plaguing the wizarding world for ages, like the fight between pure - bloods and half - bloods or the threat of dark wizards. His presence would bring a new dynamic to the story as he doesn't have the same limitations as the regular Harry Potter characters in terms of lifespan and the type of power he wields.
He could be a mentor. Given his immortality and vast combat experience, he could teach the young X - Men trainees a thing or two about fighting and perseverance.
He could be a mentor figure. Given Naruto's experience and growth in his own world, he could guide the Young Justice members in their personal and superhero development.
The Sword Rebellion could be a powerful weapon for Naruto. It might enhance his combat abilities, allowing him to face stronger foes. For example, it could cut through powerful defenses that his normal jutsu can't penetrate.
It could be a summon. Just like how Naruto has toads and Sasuke has snakes, a character in a fanfic could have a salamander as a summon. It could have unique abilities like being able to camouflage in water (since many salamanders are associated with water) and use that for stealth in battles.
It could also be a key to unlocking new ninja techniques. Naruto might learn something from the wolf's natural instincts and incorporate it into his fighting style. For instance, the wolf's speed and agility could inspire Naruto to develop a new movement technique.
They could be mentors. Since they possess different combat skills like ninjutsu, they could teach RWBY characters new ways of fighting. For example, teaching Ruby how to move faster using Naruto - style movement techniques.