Saitama is a very powerful hero in the One Punch Man universe. He can defeat any opponent with just one punch. He has a simple appearance and a somewhat laid - back personality.
Sometimes King is paired with Saitama. King, known for his false reputation of being a super - strong gamer in the original story, could be in interesting interactions with Saitama in the fanfiction's gaming context. Maybe they compete in a gaming tournament within the fanfiction, and Saitama's effortless wins baffle King.
Genos could be an unexpected opponent. He might be forced to fight Saitama due to some mind - control or a misunderstanding in the rules of the tournament. It would be really interesting to see how Saitama would handle fighting his own disciple, and how Genos would fare against his master's incredible strength.
The reason why Saitama, the one-punch superman in the second season of Monster Superman, was so strong was because he had unique physical fitness and combat skills. Saitama was an ordinary high school student before he became One-Punch Superman, but he was fatally injured in an accident, so his body was transformed into a powerful warrior.
Saitama has extremely strong strength and endurance, and can easily withstand high-intensity attacks and combat pressure. He also had a special perception ability that could accurately perceive the enemy's position and weaknesses and take corresponding countermeasures.
Saitama also mastered a unique set of combat skills, including the most basic "Saitama-style Fist" and more advanced techniques such as "Infinite Expansion Fist","Light Speed Fist","Ultimate Flash" and so on. These skills could cause huge damage in a short period of time and quickly defeat the enemy.
Saitama had also experienced many battles and training to continuously improve her combat strength and combat skills. His strong will and indomitable spirit were also one of the important reasons why he became a powerful warrior.
Well, Saitama All Fiction could potentially refer to a fan - created idea that emphasizes Saitama's ability to be above all the normal rules of the fictional One Punch Man universe. For example, his strength is so overwhelming that it's like he exists in a realm of his own, where the typical limitations of the story don't really apply to him. He can defeat any foe with just one punch, and this 'All Fiction' concept might be an attempt to explain how and why he's so powerful in such a ridiculous way.