His intelligence could be shown through his ability to adapt quickly to new situations. In a fanfiction, he might find himself in a world with different rules of physics or combat. Instead of being lost, he quickly assesses the situation, figures out how things work, and uses it to his benefit. He might even come up with new ways to use his ki powers based on the new environment.
Goku could show his intelligence by teaching others. For instance, he could pass on his combat knowledge to his friends or even to new generations of fighters. By being able to break down complex fighting moves and strategies into understandable parts for others, it shows his deep understanding of martial arts, which is a form of intelligence.
Goku could also display intelligence by making smart alliances. He realizes that in some situations, he can't win alone. So he uses his understanding of different characters' motives and abilities to form strategic partnerships. For example, he teams up with a tech - savvy character who can provide him with useful gadgets or information, and in return, he offers his protection. This shows his ability to think beyond just physical combat and consider the bigger picture.
Well, Goku's new - found intelligence can sometimes be a bit of a surprise to his friends. At first, they might be a bit skeptical or even a little intimidated. But as they see how he uses it to help them, it can bring them closer. For example, if he uses his smarts to figure out how to get to a new training ground that's really beneficial for everyone. His relationship with Vegeta could also change. Instead of just being rivals in strength, they could start to have more intellectual battles or discussions about strategy.
Perhaps the goddess has the ability to see different timelines. She sees a future where Goku is the most important figure in the universe's survival. So she travels back in time to meet him when he's still young. She becomes his mentor, guiding him not just in power but also in understanding the greater cosmos. As Goku grows up, he starts to see her not just as a mentor but as a love interest, and they develop a relationship that spans different stages of Goku's life.
Well, Goku's power level progression could be different in that he might be more in control of it. Since the head injury had some impact on his psyche, without it, he could have a more calculated approach to increasing his power. He might not rely as much on the Kaioken technique, which was developed in part due to his need to overcome limitations caused by his injury - affected development. Instead, he could focus more on pure Saiyan power - up methods like the Great Ape transformation and evolving it further.
Bulma could be one of the characters in the harem. She has a long - standing relationship with Goku and her intelligence could complement Goku's power. Another could be Chi - Chi, his wife. Her fierce loyalty and determination would make her an interesting part of the harem.
One storyline could be Goku using his smartness to outwit a new and powerful enemy. For example, instead of relying solely on his brute strength, he analyzes the enemy's weaknesses and devises a clever plan. Maybe he figures out a pattern in the enemy's attacks and uses it to his advantage, like dodging at the exact right moments and then counter - attacking with precise strikes.
His anger often manifests physically. His muscles might bulge more than usual, and his hair could stand on end even more in his Super Saiyan forms. His ki, or energy, also becomes more visible and intense. It's like a red - hot aura surrounding him.
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 could escape by overpowering Broly. He might tap into his Super Saiyan forms, like going into Super Saiyan Blue or even Ultra Instinct if he's pushed far enough. His sheer power and fighting skills could allow him to break free from whatever restraints Broly has put on him.
It could be insanely powerful. Goku already has incredible power levels, and Goku Black is no slouch either. When they fuse, it's like combining two nuclear reactors. Their power could be so great that they could effortlessly destroy planets just by flexing their newfound power. They might be able to reach Super Saiyan forms that are far beyond what we've seen in the official series, with power levels that are basically off the scale.