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.
It's hard to say. Goku has achieved many powerful forms like Super Saiyan Blue and Ultra Instinct. But Fasha was a strong Saiyan in her own right. If Fasha has been training hard in the fanfiction, she could give Goku a tough fight. However, Goku's experience in battles against strong foes like Fasha could also be a determining factor.
Vegeta can also be extremely powerful in these fanfictions. He's constantly striving to be stronger than Goku and might gain some new abilities or techniques for the tournament. Another character could be Jiren. In the original Tournament of Power, he was a very tough opponent, and in fanfiction, he might be even more powerful or have some different backstory that makes him a formidable force.
It's really hard to say. Goku has the ability to reach incredible levels of power through his Super Saiyan forms and can destroy planets. However, Naruto has the power of the tailed beasts and his Sage Mode which also makes him extremely strong. It would depend on the situation and how the writer wants to balance their powers.
In a 'Goku meets Minato' fanfiction, the idea of who is more powerful is complex. Goku's power is more on the brute force side, with his ability to constantly increase his power level through training and transformations. Minato's power lies in his speed, stealth, and unique ninja techniques. If they were to fight, Goku might seem more powerful at first glance because of his flashy attacks and high - energy blasts. But Minato could potentially outwit Goku using his intelligence and knowledge of combat tactics. It also depends on the rules of the fictional world they are in. For example, if there are limitations on Goku's ability to fly or use his ki blasts, Minato could have a better chance of winning.
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.
Goku is one of the strongest characters in the manga universe. He has insane strength, speed, and energy projection abilities. His determination and training have made him a force to be reckoned with.
Goku's strength in the manga is off the charts! He can defeat powerful enemies with his various techniques and transformations. His power level keeps increasing through intense training and battles.
The story could start with Goku being pushed to his limits by Goku Black's attacks. But then, he remembers his training with the Kai's and how they taught him to focus his energy in a more efficient way. He then uses this knowledge to create a more powerful Kamehameha that breaks through Goku Black's defenses and kills him.