Lu Bu from Dynasty Warriors is also a strong contender. He is known for his incredible strength and combat skills in his own universe. In a crossover, if he were to gain some ninja - like abilities or be able to use chakra, he would be extremely powerful. His brute force combined with new abilities could make him a top - tier character.
Sasuke Uchiha has the Sharingan and his own set of powerful jutsu. In the Naruto x Dynasty Warriors fanfiction, if he were to integrate the combat strategies from Dynasty Warriors, he could be very formidable. His ability to analyze and counter opponents quickly, along with his existing powers, would make him a powerful character in this crossover.
I think Sasuke could be one of the most powerful in a 'Naruto x Dynasty Warriors' fanfic. His Sharingan allows him to copy and predict his opponents' moves, and his Lightning - Style jutsu are very powerful. But when you consider the Dynasty Warriors characters, Cao Cao is a great strategist and a powerful fighter. He could use his intelligence to outwit the Naruto characters and his combat skills to hold his own in battle. So it really depends on how you define 'powerful' - whether it's raw strength, strategic thinking, or a combination of both.
It's hard to say for sure, but Naruto in his Sage of Six Paths mode would be extremely powerful. He has incredible chakra reserves and can use a wide variety of powerful jutsu. However, Lu Bu from Dynasty Warriors is also a force to be reckoned with. He's known for his insane strength and combat skills. So it could be a toss - up between them, depending on the situation and the environment of the battle.
It could be Master Chief if he got access to Naruto's chakra. He's already a super - soldier, and with chakra, he could become even more powerful. He could use chakra to enhance his already amazing physical abilities and his combat skills with the various Halo weapons.
In a 'Naruto x Terminator' fanfiction, it's actually hard to say who would be the most powerful. If we consider someone like Sasuke, he has the Sharingan and Rinnegan, which give him powerful visual abilities and the ability to use a variety of jutsu. Against the Terminators, he could use his Amaterasu to burn them. But on the other hand, the Terminators have their own advantages like advanced weaponry and time - travel capabilities. So it really depends on the situation and how the writer wants to play out the story.
It's hard to say for sure. Naruto has his massive chakra reserves and the ability to use powerful jutsu like the Rasengan and Sage Mode. But in the Destiny universe, characters like the Guardians have access to advanced weaponry and the power of the Light. If they could combine their powers, they would be extremely formidable. However, if we consider raw power, Naruto in his Six Paths Sage Mode could be a top contender as he has god - like powers in that form.
I think Qrow could be really powerful in a RWBY x Naruto fanfusion. He has his own set of skills and if he were to learn some of the more powerful jutsu from Naruto, like the Rasengan or some of the more advanced sealing techniques. His experience as a Huntsman and his natural combat abilities would be enhanced greatly. And Weiss with her Glyphs and if she were to learn some chakra - based techniques could also be a very powerful combination.
It could be Naruto himself if he fully utilizes the gamer abilities. With his already strong will and determination, combined with the ability to quickly level up and gain new skills from the gamer aspect, he could become extremely powerful. He has the potential to master all kinds of jutsu faster and use them more effectively in battles.
It's hard to say. Naruto has his powerful ninjutsu like the Sage Mode and the Nine - Tails chakra. But Salem has her own dark magic and immortality. If Naruto can figure out a way to counter Salem's immortality, he could be very powerful against her. However, in the RWBY world, characters like Ruby with her silver eyes power also have the potential to be extremely strong. So it really depends on how the story is written.
Naruto has a strong case for being the most powerful. His Nine - Tails chakra mode makes him incredibly strong, fast, and durable. He also has a vast array of ninjutsu at his disposal. In a crossover, he could potentially learn to use Ichigo's reiatsu in some way, making him even more powerful. Plus, his never - give - up attitude could give him an edge in a tough battle against Ichigo.
It's really hard to say. Luffy has his rubber powers and Haki which can be extremely powerful. But Naruto has the Nine - Tailed Fox and his vast array of jutsu. If they combined their powers, they would be a force to be reckoned with. However, if we consider villains, someone like Madara Uchiha with his Sharingan and all his skills, if he got his hands on a Devil Fruit, he could be extremely dangerous. But then again, Kaido from One Piece is also super tough. So, it's a tough call.