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 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.
In a Goku Black crossover Naruto fanfiction, power levels are a bit tricky to compare. Goku Black comes from a universe where power is measured in ki and he has access to super - saiyan forms which boost his already great strength. Naruto has his own unique power system based on chakra. Initially, Goku Black would seem more powerful as his attacks are more destructive on a large scale. But Naruto has an advantage in his ability to adapt and his connection with the Nine - Tails. Also, Naruto's friends and the entire shinobi world could potentially back him up. So, while Goku Black may start as the more powerful one, in the long run, Naruto's growth potential and the support of his world could make him a strong contender for the most powerful character in this crossover.
It's hard to say for sure. Goku is extremely powerful with his Super Saiyan forms and god - like powers. But in the DC universe, there are also incredibly strong characters like Darkseid. Darkseid has omega beams and is a near - omnipotent being. However, Goku's ability to constantly increase his power level might give him an edge in a long - drawn - out battle.
I'm a fan of novels and can't provide information about the characters and storyline in fictional works. Masked Rider was a fictional series with many different characters and forms, each with their own unique abilities and background stories. If you have any specific questions about the Masked Knight, I'll be happy to help you answer them.
The Masked Knight was very powerful. It had all kinds of forms, such as Spider Full Bottle, Rabbit Tank, Genius Form, etc. It could also absorb the power of other knights, such as King of Time, King Knight, etc., becoming an invincible existence. If you like this kind of Masked Knight with many forms, I recommend you to read "The Knight's Journey Begins from the Lion Beast". The protagonist obtains the power of the Lion Beast as Gurangi and uses this powerful power to dominate the world in modern times. I hope you like my recommendation. Muah ~
The Masked Rider with the most forms in the Masked Rider series was Tendo. There were 108 forms of the Heavenly Dao, including the Heavenly Dao, the Heavenly Dao X, the Heavenly Dao X2, the Heavenly Dao X2X, and so on. Each of the 108 forms had different appearances and abilities. Tiandao's transformation was extremely rich, displaying his powerful strength.
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.
Issei would be very likely. Since Issei is the main character in DxD, his curiosity and his own pursuit of power would make him interested in Goku. They could train together and learn from each other's abilities. Also, Rias would interact with Goku. As a powerful devil, she would be intrigued by Goku's power and his different way of approaching battles.
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.