Saitama's power in One Punch Man is on a whole different level. He can defeat any opponent with one punch. In the Marvel universe, there are very powerful characters like the Hulk or Thor, but Saitama's power seems almost unrivaled. Genos, on the other hand, might be closer in power level to some of the mid - tier Marvel heroes. His strength and various weapons could be comparable to someone like War Machine in terms of firepower.
One interesting storyline could be that Goku, being the ever - eager fighter, challenges Saitama not knowing the true extent of his power. Saitama, on the other hand, is just looking for a normal grocery shopping day. The clash of their personalities, Goku's excitement and Saitama's nonchalance, could lead to a very comical start. Then as the fight progresses, they both start to respect each other's power in different ways.
In a one - on - one fight between One Punch Man (Saitama) and Goku, it's really tough to say. Saitama is known for being able to defeat any opponent with just one punch. However, Goku has a vast array of powerful forms and techniques. If Saitama landed his first punch, he'd win instantly. But Goku's speed and ability to constantly power up could potentially give him an edge. He could keep dodging Saitama's punches until he found a way to overpower him. It really depends on how the fight is set up in the fanfiction.
One way could be that Doctor Doom's power lies more in his intelligence and use of technology and magic. So, he could find ways to level the playing field against Saitama. For example, he could create power - nullifying fields or devices. Saitama, on the other hand, might not fully understand the nature of Doctor Doom's power, which could also add an interesting dynamic.
In a battle between One Punch Man and Superman, it's really tough to say. One Punch Man can defeat any opponent with just one punch. But Superman has incredible strength, speed, and a whole bunch of other powers like heat vision and flight. If One Punch Man managed to land his one punch, he could win. However, Superman's speed might make it difficult for One Punch Man to even get a hit in. So, it could go either way depending on the circumstances.
Similarities? Well, both are super - powerful. They both are often the ones to save the day in their respective universes. Differences? One Punch Man's power is very straightforward - that one punch. Superman has a whole range of powers. In fanfiction, One Punch Man might be more of a comical character in his overpoweredness, while Superman is more of a traditional hero figure.
Another storyline could be that Thanos, aware of One Punch Man's power, tries to use the Infinity Stones to either eliminate him or make him an ally. There could be a long - drawn - out battle where One Punch Man has to constantly dodge Thanos' attacks while trying to find a way to land his one punch. In the end, he manages to do it and saves the day.
One interesting plot point is the clash of power systems. Goku's ki - based attacks and transformations like Super Saiyan contrast sharply with Saitama's pure physical strength. For example, in some fanfictions, when they first meet, there's a sense of mutual curiosity about each other's power sources.
Another interesting piece of fanfiction is one that delves into a tournament - style story. Goku, being the battle - hungry Saiyan he is, enters a tournament in the One Punch Man world. Here, he meets all kinds of unique fighters. The fanfiction does a great job of exploring how Goku's fighting style and abilities interact with the different power - scaling and rules of the One Punch Man universe. It's a really engaging read for fans of both series.
One interesting scenario could be that Saitama and Tornado team up against a super powerful villain that neither could defeat alone. Their different powers - Saitama's overwhelming strength and Tornado's psychic abilities - would make for an exciting combination.