Well, Naruto's already powerful with his chakra and ninja techniques. If he became the Hulk, his physical strength would skyrocket. He could probably lift mountains just like the Hulk can. His durability would also increase exponentially. In battle, he might not need to rely so much on his ninjutsu as his brute strength would be enough to take on most opponents. His healing factor could also be enhanced, like the Hulk's, so he could recover from injuries much faster. And his senses, which are already sharp as a ninja, could become even more acute, allowing him to detect enemies from afar and react quickly, all while having the Hulk - like appearance and power.
His powers would be a really interesting mix. Naruto's ability to use shadow clones could be on a whole new level. Instead of just creating a few dozen clones, he could create hundreds or even thousands like the Hulk can multiply his strength in some versions. And his Nine - Tails chakra might combine with the Hulk's rage - induced power. So when he's in his Hulk - like form, he would not only be physically strong but also have the added boost of the Nine - Tails' power, making him an almost unstoppable force. He could also potentially use the Hulk's jumping ability to traverse long distances quickly, which would be a new addition to his ninja - like mobility.
He'd be extremely powerful. Accelerator's power of vector manipulation would give Naruto a whole new level of combat ability. He could deflect attacks with ease and launch powerful counter - attacks. His movement would also become more precise and unpredictable.
He might have a combination of his ninja powers and some sort of fire - based quirk from Endeavor. His Rasengan could be enhanced with fire, creating a really powerful and destructive attack.
His powers could be a mix of ninja skills and Thanos - like abilities. He might have enhanced physical strength similar to Thanos. His Rasengan could potentially be charged with some sort of energy related to the Infinity Stones. Also, his ability to sense chakra might be modified to sense other forms of power. Maybe he could even teleport like Thanos does in the comics, which would give him a huge advantage in combat.
His powers would still be based on chakra, but he'd have to adapt them. His jutsus like the Fireball Jutsu could be modified to work with the elements in RWBY, like using Dust to enhance it. His Sage Mode would give him an even greater boost in combat against the Grimm.
He would likely have a combination of his existing ninja powers and Asgardian powers. So, he could still use his shadow clones, but also be able to summon lightning like Thor. Maybe he could even use his chakra to enhance his Asgardian abilities further.
He'd probably have some enhanced Sharingan abilities. Maybe he could awaken the Mangekyou Sharingan more easily and have unique powers associated with it. His chakra levels could also be different, perhaps even more powerful due to his Uchiha blood. He might also have an innate understanding of space - time ninjutsu like Madara did.
Naruto's powers would be a strange mix. He could inherit Orochimaru's ability to regenerate, but in a more Uzumaki - style way. His rasengan could be infused with snake venom or some sort of snake - based chakra. And he might be able to use Orochimaru's body - switching jutsu in a modified form, perhaps using it not for evil but for strategic purposes in battles.
His relationships would be very different. With his friends like Sasuke and Sakura, they might be a bit confused or even scared at first. Naruto, now with Vergil's personality, could be more aloof and distant. But over time, they might learn to understand and work with this new Naruto.
Well, Naruto's transformation into a Super Saiyan would likely bring a whole new level of energy manipulation. The Super Saiyan form is known for its intense ki energy, and Naruto's chakra could blend with it in interesting ways. His stamina would probably increase, enabling him to fight for longer periods without getting tired. His ability to sense danger and opponents might also be heightened, similar to how Saiyans can sense ki. And his overall presence on the battlefield would be much more intimidating.
If Naruto was the grandson of Madara and Tsunade in a fanfiction, his powers would be a unique combination. Tsunade's influence could give him the ability to create and manipulate chakra in a more efficient way for medical purposes. He might be able to heal not only physical wounds but also mental and chakra - related imbalances. From Madara, he could inherit the power to manipulate space - time, like Madara's use of the Rinnegan for teleportation. His Rasengan could then be used in conjunction with this space - time manipulation, allowing him to surprise his opponents. His power level would be off the charts, and he would need to learn to control these new abilities, which could be a central part of the fanfiction's plot.