You can start by looking on fanfiction websites like Archive of Our Own (AO3) or FanFiction.net. These platforms have a wide range of fanfictions about Saitama's powers. Just use the search function and type in relevant keywords like 'Saitama powers' to filter the results.
Another theme is the origin of Saitama's power. Since it's not fully explored in the original manga/anime, fanfiction writers like to come up with their own theories and backstories. This can range from scientific experiments gone wrong to some sort of divine intervention.
Saitama's overpowered strength would likely be a huge disruptor in the MHA world. His simple yet extreme power of being able to defeat any enemy with one punch would make him a top - tier hero instantly. Genos, with his advanced cybernetic enhancements, would also be quite formidable. He could potentially be part of the development of new support items or hero gear in the MHA universe, given his knowledge of technology. And his combat abilities would put him in the ranks of the stronger heroes there.
Saitama's overpowered nature would completely disrupt the power balance in the MHA universe. His simple yet extreme strength and speed would make him an outlier. For example, in MHA, most heroes have to strategize and work in teams against villains. But Saitama could just one - punch most threats away. This would change the way villains operate as well, perhaps making them more desperate or more likely to target Saitama directly. It could also lead to interesting scenarios where heroes might be both in awe and a bit intimidated by his presence.
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.
One way is to explore his life before he became a hero. Maybe he had a normal job and was constantly frustrated with the mundanity of it. This could have been the catalyst for his intense training.
A plot where Saitama travels to different dimensions in the One Punch Man universe. He could encounter strange versions of himself or other heroes and villains, leading to humorous and action - packed situations.
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.