The Uzumaki sword might have the power of sealing. The Uzumaki clan was known for their sealing techniques. So, it's possible that the sword can be used to seal away powerful enemies or even seal away dangerous jutsu. It could also have the ability to cut through powerful defenses. Maybe it has some sort of special chakra edge that can break through barriers that are otherwise difficult to penetrate. Additionally, it could have a connection to the Uzumaki's life - force, allowing Naruto to draw on some of that power in times of need.
One special ability could be the power of attraction. It might attract other Uzumaki artifacts or people related to the clan. This would help Naruto in his journey to learn more about his roots. It could also have a self - healing ability. If the sword gets damaged in battle, it might be able to repair itself using Naruto's chakra. And perhaps it has a communication ability, where it can convey messages or memories related to the Uzumaki clan to Naruto when he holds it.
The sword might also have a connection to the spirit world. It could allow Naruto to communicate with the spirits of the Uzumaki clan or gain insights from their past. This would give him an edge in battles as he could learn from the experiences of his ancestors.
The sword might be able to enhance Naruto's existing jutsus. For example, his Rasengan could become more powerful when combined with the sword's energy. It could also give him new elemental powers, like the ability to control lightning or fire in a different way than before.
One possible ability could be enhanced cutting power. It can slice through the toughest of materials, like it's cutting through butter. For example, it could easily cut through solid rock or even chakra - enhanced defenses.
Maybe the dragon sword has the ability to absorb chakra. When Naruto is in a fight, he could use this to his advantage by draining his opponents' chakra through the sword when it makes contact. This would weaken his enemies and at the same time, the absorbed chakra could be used to power up the sword's other abilities.
One possible ability could be enhanced cutting power. It might be able to cut through almost any material, even chakra - based defenses with ease.
In many fanfictions, Naruto might obtain the Uzumaki sword through a hidden inheritance. Maybe it was left behind by an ancient Uzumaki clan member and Naruto discovers it in a secret location, like an old, forgotten Uzumaki shrine.
Since Naruto is known for his shadow clones, their son could have an upgraded version of this ability. He might be able to create clones that not only look like him but also have different skills based on Talia's abilities. For instance, some clones could have her stealth skills while others could have her strategic thinking abilities, making his combat and problem - solving strategies much more diverse.
He could use it to discover more about his Uzumaki heritage. Maybe the sword has some special powers or markings that are related to the Uzumaki clan. It could also put him in danger as others might be after the sword for its power or value.
The sword could have the ability to cut through any chakra - based attacks. Since Naruto's world is full of ninjas using chakra, this would be a very useful ability. It would allow Naruto to easily defend against and counter his opponents' attacks.
One possible plot development could be that the Uzumaki clan immediately recognizes Naruto's potential and starts training him in their unique jutsu. Since the Uzumaki are known for their strong life force and sealing techniques, Naruto might quickly master some of these skills, giving him an edge early on. He could also learn about his family heritage, which might change his perspective on himself and his place in the ninja world.