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.
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.
Well, he would probably be a very different person. He might be more in tune with the Saiyan warrior culture. He could be more aggressive and less empathetic compared to the Goku we know. He would grow up learning the ways of the Saiyans on Planet Vegeta, which means he'd be trained to fight and conquer from a very young age.
The plot might center around Goku being raised by Beerus in a more secluded place. Beerus could be training Goku to be his successor as a god of destruction. Goku would have to learn about the balance of destruction and creation, which is different from his usual Saiyan power - up goals. This would also mean that Goku would have a different view on the universe and its inhabitants. He might be more detached in some ways, but also more powerful and with a different moral code influenced by Beerus.
His power would develop more in line with Saiyan traditions. He'd probably have a stronger base power due to the intense training environment on Planet Vegeta. There would be more emphasis on raw power and combat skills from a young age.
One idea could be a story where the Grand Priest and Zeno are on a journey through the universes to understand the different cultures. They could encounter various powerful beings and have to make decisions about how to handle them. For example, they might come across a universe where the inhabitants are facing a great danger and they decide to use their powers to help.
I haven't actually read this fanfic yet. But if it's about Zeno and the Grand Priest, it could be really interesting. Maybe it explores their relationship in a whole new way, like how they interact behind the scenes in the multiverse. It could also introduce some unique plot twists based on their powerful positions in the Dragon Ball universe.
Fanfiction about the Grand Priest and a reader can be really interesting. It often explores unique relationships. Some might focus on the Grand Priest's mysterious nature and how the reader character interacts with it. It could be a story of adventure where the reader gets involved in the Grand Priest's world.
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.