Goku could develop a deeper understanding of the power he wields. The Grand Priest's training would not only focus on physical strength but also on the spiritual aspect of ki. This could lead to Goku having a more profound connection with his Saiyan heritage and the energy that flows within him. He may also become more patient, as the Grand Priest's training methods might be complex and require time to master.
In fanfiction, if Goku trains with Grand Priest, he might achieve new levels of power. Goku is always eager to get stronger, and the Grand Priest is extremely powerful. He could learn new techniques that are beyond the Saiyan's current understanding, perhaps even something related to the Angels' unique powers.
If Naruto is trained by Goku in fanfiction, his character would experience significant growth. Naruto is already a determined character, but Goku's training could make him even more so. He would learn to value hard work in a different way. His relationships with his friends might also change as he becomes more self - reliant in his training. Additionally, Naruto's sense of justice could be broadened by Goku's more universal view of protecting the innocent. He would no longer just be focused on his village but on a larger scale of good and evil, making him a more well - rounded and developed character.
His character would become more confident. With Goku's support and the newfound power from being in the Dragon Ball universe, Naruto would have less self - doubt. He'd be more eager to take on challenges.
His social skills might be different. Instead of the somewhat naive Goku we know, he could be more aware of social norms. Bulma could teach him about proper behavior, but at the same time, his Saiyan impulsiveness would still shine through at times. So he might be a strange mix of a well - mannered person in some situations and a wild fighter when provoked.
His character would develop a more strategic side. Beerus is a very strategic fighter, and Goku, being raised by him, would learn to think more before acting in battles. He would also become more aware of the power hierarchy in the universe at a younger age, which could make him more cautious or more ambitious, depending on how you look at it. Additionally, his Saiyan pride might be tempered by Beerus' teachings, making him more of a team player in some ways.
Goku would likely become more content. Knowing his family is taken care of or reunited, he'd have a new - found sense of peace. This might make him less reckless in battles as he has more to lose.
His personality might change in several ways. He would probably be more humble as he realizes the vastness of the power he is being exposed to. Also, he could become more of a mentor - like figure to the younger ninjas in Konoha. Since he is getting trained by such a powerful entity, he would have a greater sense of responsibility and would want to pass on his knowledge. He might also become more open - minded, as the Grand Priest's teachings could expose him to new ways of thinking and different cultures if the fanfiction has elements of different universes interacting.
Goku might become more in touch with his Saiyan heritage. His tail was a part of what made him a Saiyan originally, so getting it back could make him more aware of his roots. He could become more aggressive in battle, like how Saiyans are known to be.
Naruto becomes more self - reliant. When he's out training on his own, he has to learn to make decisions without the help of others. He also gains a broader perspective as he meets different people during his travels. This exposure to new cultures and ways of thinking in fanfiction enriches his character. He starts to understand that there are many different paths to power and that he can learn from everyone. His ninja skills improve, of course, but his mental and emotional growth is just as significant.
Well, Naruto would probably become extremely powerful. Goku's training methods are intense and focus on pushing physical limits. Naruto, with his already strong will and chakra, could gain new levels of strength. He might learn how to better control his chakra in ways similar to how Goku controls his ki. Also, Goku could teach Naruto some of his signature moves, like the Kamehameha, which Naruto could potentially adapt to his own style using chakra.