For Naruto, being trained by Madara could mean he learns how to counter Uchiha - specific techniques more effectively. His physical strength might also increase due to the intense training. Sasuke would be able to better harness his hatred and turn it into a more focused power source. Madara's teachings could expose them to ancient jutsu and knowledge that would give them an edge over their enemies. Their teamwork might also be affected, as they would both be influenced by Madara's way of thinking.
His combat abilities would become more diverse. Madara could teach him new forms of taijutsu and ninjutsu. For example, Naruto might learn some of Madara's signature space - time ninjutsu, which would give him an edge in battles. His chakra control would also improve as Madara is very proficient in chakra manipulation.
Naruto would probably get Madara's Sharingan abilities. This could give him enhanced perception and the ability to copy jutsu more easily, like a supercharged version of his own ability. He might also gain access to Madara's Susanoo, which would be a huge boost to his combat capabilities.
Naruto would likely become more serious. Madara's influence would probably make him less impulsive. For instance, he would think twice before charging into battle without a proper plan.
His speed would increase a great deal. Whis is very fast and could teach Naruto how to move more swiftly. Also, Naruto's chakra control might be enhanced, allowing him to perform more complex jutsus with less effort.
They would likely have a complex relationship. At first, they might be wary of Madara as he has been their enemy in the past. But as they train under him, they would start to respect his skills and knowledge. Naruto might try to understand Madara's motives and see if there's any good in him. Sasuke, having an Uchiha connection, might feel a stronger sense of kinship but still be cautious. Madara, for his part, would probably see them as tools at first but gradually develop a strange sort of respect for their growth.
If Naruto was trained by Shang Tsung, his abilities would likely become much more diverse. Shang Tsung has a lot of knowledge about different fighting styles and dark magic. Naruto might learn some sneaky and underhanded tactics which are not typical in his usual ninja training. His chakra control could also be enhanced in new ways, perhaps to mimic some of Shang Tsung's shape - shifting abilities on a basic level. For example, he could use his chakra to change his appearance slightly to deceive opponents, adding a whole new dimension to his combat skills.
Naruto's abilities would change significantly. Ichigo has unique spiritual powers, and through his training, Naruto might develop a form of 'spiritual chakra'. His ninjutsu could become more powerful as he combines the new understanding of energy with his existing chakra control. Also, Naruto's combat strategy would shift as he learns from Ichigo's more direct and aggressive fighting style.
If trained by Sanji, Naruto's sensory abilities could get better. Sanji has a good sense of smell which he uses in various situations. Naruto could learn to use his senses more effectively, not just relying on his chakra senses. Also, Naruto's ability to endure pain might increase. Sanji has endured a lot in his life, and he could pass on some of that mental toughness to Naruto, allowing him to push through tougher battles and train harder without getting worn out as easily.
His speed would increase. Goku Black is very fast, and his training could make Naruto move at blistering speeds. Also, Naruto's power attacks would be stronger. Goku Black's training methods would push Naruto to new limits.
If Naruto were trained by Madara and Hashirama, his fighting style would be a blend of their two distinct styles. Madara was known for his powerful and aggressive attacks, while Hashirama was more about using nature chakra and large - scale jutsu. Naruto would start to use his shadow clones in more complex ways, like setting up traps as Madara did. He'd also become more proficient in using natural elements in combat, perhaps creating new jutsu that combine his existing Rasengan with wood - style or other nature - based elements. His movement would be more fluid, taking cues from both Madara's agility and Hashirama's stability in battle. This new fighting style would make him an even more formidable opponent, not just in the Leaf Village but across all the shinobi world.