Well, perhaps it could be about Izuku learning Goku Black's unique combat styles and techniques. Maybe Goku Black would push Izuku to his limits in training, helping him gain new powers and a more ruthless edge in battle.
Another possibility is that in the world where Goku Black comes from, there is an enemy who follows Goku Black to Izuku's world. This enemy could be a powerful Saiyan or a being with a dark ki similar to Goku Black. They might see Izuku as a weakness in Goku Black's plan and try to eliminate him first, making them the main antagonist in the fanfiction.
If Naruto were trained by Goku Black in fanfiction, it would be a wild combination. Goku Black is from a different universe with different power systems. He could introduce Naruto to concepts like ki, which might blend with Naruto's chakra in interesting ways. Naruto's physical abilities would likely skyrocket, and his combat strategies would be completely revolutionized. He might start using more acrobatic and flashy moves, like Goku Black does.
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.
It could be that the story focuses on how Izuku's character changes under Batman's training. Batman might teach him about the importance of preparation and having a backup plan. Izuku, on the other hand, could teach Batman about the power of hope and believing in oneself unconditionally. The fanfiction could also explore how Izuku uses the skills he learned from Batman in his own world, against villains like All for One, in a completely new and unexpected way.
In this fanfiction scenario, Naruto would likely become extremely powerful. Goku's training methods are intense and focus on pushing physical limits. Naruto could learn new combat techniques and ways to better control his chakra. His strength, speed, and overall combat abilities would see a huge boost.
Well, in such a fanfiction, Harry Potter would probably gain some amazing physical abilities from Goku's training. He might be able to move at super - fast speeds and have enhanced strength. His magical skills could also be combined with Goku - like combat techniques, making him an even more formidable wizard in battles against Voldemort or other dark forces.
If Naruto gets trained by Goku in fanfiction, it could be amazing. Goku's training often involves pushing the body to its limits. Naruto, who is already used to tough training, would adapt. He might gain the ability to fly like Goku, which would be a huge advantage in battles. Also, Goku's sense of justice and determination could rub off on Naruto, making him even more committed to protecting his village and friends.
Well, Goku's training is intense. It might involve extreme physical conditioning like his gravity training. Naruto could be pushed to his limits in terms of strength and speed. He'd probably learn about ki control, which is different from chakra but could enhance his abilities. Goku might also teach Naruto about the importance of a strong mental state during battle, something Naruto already has a bit of but could be refined.