He might gain the ability to control the tailed beasts more directly. Since the Gedo Statue has a connection to the tailed beasts, Naruto could potentially use this new power to better communicate with them or even draw on their strength more easily.
Naruto might be ostracized by some in the ninja world. People could be afraid of his new power, especially if they don't understand it. They might see him as a threat, similar to how they once feared the Uchiha for their powerful Sharingan. So, he may have to deal with a lot of distrust from his comrades and the general public.
Naruto could potentially gain the power of infinite chakra. Since the Ten - Tails is a source of massive chakra, absorbing it may give Naruto an unending supply, allowing him to use high - level jutsu continuously without getting tired.
He might gain the power of omnipotence. Just imagine, he could be able to control all the elements at will, not just the ones he already knew like fire, water, etc. He could also have the power to teleport anywhere in an instant, which would make him an even more formidable opponent in battles.
In some fanfictions, if Naruto absorbs Gedo Mazo, he might gain incredible power. This could potentially change the entire power dynamic in the Naruto universe. He could use the dark chakra within the Gedo Mazo in unexpected ways, perhaps even finding a way to purify it and use it for good.
Well, Naruto could gain the ability to heal in a more advanced way. Just as the avatar can sometimes use their connection to the elements to heal, Naruto might be able to do the same with his chakra. He could also have the power to merge with the natural world around him, similar to how the avatar can connect with nature. This would give him an edge in stealth and surprise attacks. Plus, he could develop a new form of sensing, being able to detect not just chakra but also the energy of the elements around him.
In this type of fanfiction, Naruto could potentially gain the power to control water more proficiently as Uzushiogakure was known for its water - based jutsu. Maybe he'd also gain some unique sealing techniques that were passed down in Uzushiogakure.
Well, considering the devilish nature of Rias' world, Naruto could gain the power of flight, which is not something he has in his original ninja world. He could also gain the power to resist holy attacks, as devils are often weak against holy elements. Another power could be the ability to create and control demonic flames. These new powers would not only change his combat capabilities but also how he is perceived in this new fanfiction world.
In some fanfictions, Naruto might gain the ability to absorb Samehada through a special encounter. Maybe he discovers an ancient jutsu that allows him to connect with Samehada on a spiritual level and absorb its power.
He might gain a deeper understanding and control over the Six Paths powers. Maybe he can access different levels of chakra that were previously unknown. For example, he could have a more direct connection to the natural energy around him, allowing for more powerful and precise jutsu.
He might gain enhanced physical strength like Bane. Bane was known for his brute force, so Naruto could have a similar boost, being able to overpower his opponents more easily in hand - to - hand combat.