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.
Saitama is the main character. He is a bald - headed hero who can defeat any opponent with a single punch. He's a bit of an underdog in the sense that his power is so great that he's bored with fighting most of the time.
Saitama is the most important character. He's the one - punch hero. Genos is also important. He's Saitama's disciple and has a cyborg body with powerful attacks. King is another key character. He's often mistaken for a very powerful hero when in fact he's just an ordinary guy who is lucky. Tatsumaki, the Tornado of Terror, is a very strong esper - type hero.
Genos is also a main character. He is a cyborg who becomes Saitama's disciple. He is very powerful but not nearly as strong as Saitama. He is constantly seeking ways to improve his strength and learn from Saitama.
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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.
Saitama is definitely one of the most interesting characters. His nonchalant attitude towards his incredible power is quite unique. He can defeat any foe with one punch but is still searching for a sense of purpose and a worthy opponent.
The main character is Saitama. Genos is also important as he is Saitama's disciple. King is another significant character, known for being wrongly perceived as a very powerful hero.