Well, it depends on the context. If the battle takes place in the Naruto universe, Naruto might have an advantage as he is more familiar with the terrain and can use chakra - based attacks that Saitama may not fully understand at first. For example, Naruto could use shadow clones to surround Saitama and then attack with a Rasengan. But Saitama's raw power is still a huge factor. In the end, it could go either way depending on how the author writes the story.
It's a tough call. Goku has the ability to keep getting stronger through training and achieving new forms like Ultra Instinct. However, Saitama has shown that he can defeat any opponent with one punch so far. But Goku's powers are more defined in terms of levels and growth potential. So, it's hard to say who would be the strongest in a crossover. It could depend on the situation and how the writer wants to portray their encounter.
Definitely Naruto and Saitama. Naruto's energetic and determined personality against Saitama's laid - back and seemingly bored attitude would create a great contrast. Naruto would be constantly amazed by Saitama's power, while Saitama would be a bit puzzled by Naruto's complex world of ninjutsu and chakra.
It's hard to say for sure. Naruto in his Sage of Six Paths mode is extremely powerful, with access to a vast amount of chakra and the ability to create and manipulate Truth - Seeking Balls. But Ichigo, when he reaches his final form, can also be a force to be reckoned with, having the combined powers of his Hollow, Quincy, Soul Reaper, and Fullbringer heritage.
It's likely Saitama. His power is to defeat any enemy with one punch, which is an extremely overpowered ability. Even though Ben has a wide variety of powerful aliens in his Omnitrix, none of them seem to have an ability that can match Saitama's sheer strength and simplicity of his power.
It's really hard to say. Saitama is known for being able to defeat any opponent with one punch in his own universe. But in the DBZ universe, characters like Zeno can erase entire universes. However, Saitama's power seems to be limitless in a different way. He doesn't seem to have any physical limits like the Saiyans do. So it could be Saitama if his power translates well into the DBZ universe, or it could be Zeno who has such a high - level power over existence.
Another idea is that Naruto, curious about other powerful beings, uses a jutsu to travel to the One Punch Man universe. There, he would be amazed by Saitama's strength. Naruto could try to learn from Saitama how to be so effortlessly strong, but Saitama would probably just shrug it off and say there's no special trick. They could team up to fight some of the monsters in Saitama's world, with Naruto using his ninjutsu and Saitama just punching things away.
Saitama and Naruto would have a rather comical interaction. Naruto is very talkative and enthusiastic, always ready to make friends. Saitama is the opposite, very laid - back and not overly expressive. Naruto would probably be constantly trying to engage Saitama in conversations about power and heroism, while Saitama would just be like 'yeah, whatever'. But when it comes to fighting together, Naruto's quick thinking and Saitama's brute force would complement each other well.
Harry Potter himself would be an interesting character to crossover into the One Punch Man universe. He would be completely out of his element in a world full of superheroes and monsters. His magic skills would be a new and strange power there. He could team up with Saitama and learn about a different kind of heroism. Also, his experiences with fighting Voldemort could give him unique insights when dealing with the villains in One Punch Man's world.
I think Eren and Saitama would also be a great pair. Eren has his complex motives and the power of the Titans, and Saitama is so simple - minded yet incredibly strong. They could interact in a really unique way, like Eren being all fired up to fight Titans and Saitama just being like 'Oh, that's nice' and then one - punching all the Titans. It would be a contrast of personalities and powers.
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.