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.
The Saiyan race might be affected differently. Gohan might not be born, or if he was, he would be raised in a completely different environment. Without Goku as a father in the traditional sense, Gohan could potentially turn out to be more independent or follow a different path in life, perhaps not even being interested in fighting like his father was.
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.
One scenario could be that Goku enters a special realm where time and space work differently. In this realm, the laws of biology are altered, and his tail simply regrows. Another might be that an enemy's attack, instead of harming him further, accidentally triggers a hidden regenerative ability in Goku that causes the tail to grow back.
One scenario could be that Goku surprises Beerus with his speed and initial attacks as SSJ4. But then Beerus counters with his hakai and forces Goku to dodge constantly. Another could be that Beerus underestimates Goku at first and Goku manages to land some powerful blows.
No. Goku is a character from a fantasy anime world with superpowers like flying and shooting energy blasts. The world of Pulp Fiction is a more realistic (in a crime - noir sense) world. It would be completely out of place for Goku to exist there.
" The Spiritual Martial World " was a novel created by Yu Feng that traveled through the Spiritual Martial World. The story was about the protagonist, Lu Shaoyou, who became a dead young master after transmigrating. For the sake of his family, his beauty, and the people closest to him, he embarked on the path of the strong. On this thorny path, he worked hard to grow and eventually became a king. The novel combined martial arts and spirit dao. The legendary peak of martial arts and the pinnacle of spirit dao were both in his grasp. Although the specific plot and chapter information of the novel were not provided, according to the content summary and related comments provided, it could be seen that this was a fantasy novel full of creativity and intense battles.
Goku's powers are on a much higher scale. His ability to destroy planets as a Super Saiyan makes him far more powerful than Naruto at his strongest. Naruto's jutsu are mainly focused on the ninja world, while Goku's powers are universal.
Goku is a pure - hearted and somewhat naive Saiyan when it comes to relationships. Launch, on the other hand, has her dual personalities. In a fanfiction, their different personalities can clash. For example, Goku's straightforwardness might annoy Launch's sweet side, while her tough side might find his naivete endearing. It could lead to some comical situations.
He could die in battle. Maybe a new, extremely powerful villain emerges who has the ability to nullify Goku's powers or is just so strong that Goku's attacks have no effect. After a long and intense fight, Goku is defeated and dies.