He could develop the ability to counter - attack more effectively. Since he can see the future, he would know exactly when and where an enemy will strike. This could lead to him developing a new fighting style that focuses on preemptive strikes and perfect defenses.
One new ability could be enhanced strategic planning. Naruto could use his future sight to plan out battles on a much larger scale. He might be able to see the long - term consequences of his actions in a fight, so he could develop the ability to manipulate the battlefield in ways that others can't. For example, he could set up traps in places where he foresees the enemy will be. Also, he could potentially develop an ability to share his future sight with his allies, allowing them to also benefit from this power during team battles.
Naruto could develop the ability to anticipate and avoid genjutsu more easily. Since he can see the future, he might be able to sense the start of a genjutsu before it fully takes effect. He could also develop an ability to see the true intentions of people more clearly. This is because his future sight might give him insights into people's future actions, which are often linked to their true motives. Additionally, he could use his future sight to better understand the flow of chakra in his body and the world around him, leading to more efficient use of his own chakra and new techniques based on that understanding.
He could develop the ability to combine the power of the Sharingan with the Nine - Tails' chakra. Maybe he could use the Sharingan to better control the Nine - Tails' power, for instance, seeing the flow of the chakra inside him more clearly. This could lead to new jutsu that are a fusion of Uchiha and Uzumaki techniques.
He could have the ability to use all six paths techniques right from the start. This means he could manipulate gravity like the Deva Path, absorb chakra like the Preta Path, and even revive the dead like the Outer Path.
He could develop the ability to use the Six Paths Sage Mode more effectively. Since the Rinnegan is related to the Sage of Six Paths, it would enhance his connection to that power. He might also gain the ability to create chakra chains similar to those of the Uzumaki clan but with an added Rinnegan - powered twist.
He could have the ability to see chakra flow in extreme detail. This would allow him to not only detect enemies from afar but also predict their moves based on how their chakra is moving. He could also potentially have enhanced vision in non - combat situations, like being able to see in the dark much better.
He could develop the ability to use the Preta Path more effectively. This path allows the user to absorb chakra, and Naruto could use it to nullify enemy attacks that rely on chakra. For instance, if an enemy uses a powerful fire - style jutsu that is chakra - based, Naruto could absorb the chakra of the attack, rendering it useless.
One new ability could be enhanced physical combat skills. Tsunade's strength gives Naruto the power to deliver more powerful punches and kicks, which could be a game - changer in close - quarters battles. He might also develop the ability to use medical ninjutsu more effectively. Since Tsunade is a master of it, Naruto could learn to heal himself and others faster during battles, adding a new dimension to his fighting capabilities.
One new ability could be the power to charge his own body with kinetic energy for enhanced physical attacks. He could deliver punches or kicks that explode on contact, similar to Gambit's charged staff strikes. Another ability would be to create energy barriers by rapidly charging the air around him. This would be a great defensive move, something Naruto currently lacks in his regular skill set. He could also potentially use Gambit's power to sense the energy levels of his enemies from a distance, giving him an advantage in strategizing his attacks.
He could develop the ability to better withstand the different climates in One Piece. Since he's immortal, he might experiment with his body in ways others can't. Maybe he could learn to breathe underwater like a fish - man over time due to his long - lasting life.
He could develop enhanced physical abilities. Since he can't rely on chakra, he might focus on building muscle strength and speed through intense physical training. He could also become an expert in using various ninja tools. For example, he could master the use of shuriken and kunai in ways that others haven't. Another ability could be better observational skills. He'd need to be more aware of his surroundings and his opponents' movements without the help of chakra - based sensing techniques.
He could develop the ability to transform into a more powerful form that combines the features of all nine tailed beasts. Maybe he could have nine tails of different colors or shapes, each representing a different tailed beast, and with each tail comes a special power.