Another candidate could be Dialga from Pokemon. Dialga has the power to control time. In a crossover, if it could use its time - control abilities effectively against the Dragonball Z characters, it could be very powerful. For example, it could freeze time and then attack its opponents without them being able to react. But again, Goku has shown the ability to break through all kinds of limitations, so he might still find a way to defeat Dialga in the end.
In a fanfiction that combines these two universes, it really depends on how the powers are combined. If we consider pure raw power, perhaps a fusion between Goku and a Legendary Pokemon like Dialga would be the most powerful. Dialga can control time, and Goku has his Super Saiyan forms and vast combat experience. But if we look at strategic power, a trainer like Cynthia who has a deep understanding of Pokemon and somehow acquires the ability to use Ki could be extremely dangerous. She could outwit her opponents and use her Pokemon's and her own newfound powers to dominate in battles.
It's hard to say, but Goku would be a top contender. His ability to constantly increase his power level and learn new techniques would make him a force to be reckoned with, even in a world with Pokemon. He could potentially use his Ki to enhance the abilities of any Pokemon he teams up with.
In a crossover, it really depends on how the powers are combined. If Naruto could somehow combine the Nine - Tails' chakra with Sage Mode and then learn some ki techniques from the Dragonball Z side, he could be extremely powerful. But Goku has been training for a long time and has access to godly ki. So he would be a top contender as well. Vegeta too, with his own determination and power - ups, could also be in the running for the strongest.
It's hard to say. Goku in his Super Saiyan forms has incredible power and can destroy planets. But Naruto has the Nine - Tails' power and Sage Mode. If we consider Naruto at his peak with all the tailed beasts' power combined, he could give Goku a tough fight. However, Goku's ability to constantly increase his power level might give him an edge in the long run.
It's hard to say for sure. Goku in his Super Saiyan Blue form has incredible power levels. But Naruto in his Baryon Mode also has a huge amount of power. However, if we consider the potential of fusing their powers, it might be a character who combines the best of both worlds. Maybe a fusion of Naruto and Goku would be the most powerful. They could have the ki - based attacks of Goku along with the ninja techniques of Naruto.
Another interesting pair could be Sakura and Bulma. Sakura is a strong - willed ninja with medical skills, and Bulma is a brilliant scientist. They could collaborate on creating new technologies or medical treatments. Bulma could be fascinated by the chakra system in the Naruto world and try to find ways to use it in her inventions, while Sakura could learn a lot about advanced technology from Bulma.
Zoro and Piccolo would also make for an interesting pair. Zoro is a master swordsman always seeking to become stronger, and Piccolo is a powerful Namekian with great combat skills. They could have some intense training sessions together, sharing their knowledge of combat and power - up techniques.
I think Sailor Moon and Goku would be a really interesting combination. Sailor Moon is all about love and justice, and Goku is just a pure - hearted fighter. They could learn a lot from each other. Goku could teach Sailor Moon about physical combat and pushing her limits, while Sailor Moon could show Goku the power of love and friendship in a different way than he's used to in his own universe.
Gohan in his Ultimate form could also be a very powerful character in this combined fanfiction universe. He has incredible strength and intelligence in combat. But on the RWBY side, Ozpin has a lot of hidden power and knowledge. Still, when comparing their power levels, Gohan's physical strength and energy projection abilities are on a different scale. He could potentially take on even the toughest Grimm with ease. So, overall, Gohan might be among the most powerful in this crossover scenario.
It's really hard to say. Goku from Dragonball has insane power levels that can destroy planets. But Naruto has his own unique abilities like the Nine - Tails' power and his Sage Mode. And if a god is involved, it could be the most powerful as gods usually have omnipotent powers in fanfictions. But it really depends on how the author writes it.