Tornado of Terror would likely be one of the first to try and take on Evil Saitama. She's powerful and confident, but she would soon realize the extent of his power. Mumen Rider, despite being weak, would still stand up to Evil Saitama out of a sense of justice. He would be quickly defeated but his act of courage might inspire other heroes to step up.
When it comes to a fanfiction about Saitama's training days, it has the potential to be really engaging. We could see the evolution of his training methods, perhaps from simple exercises to more complex and extreme ones. It might also explore his interactions with the people around him during that time, if there were any. For example, did he have any mentors or friends who supported or doubted him? This kind of fanfiction can add a whole new layer to Saitama's character and make us appreciate his journey to becoming One Punch Man even more.
Saitama in One Punch Superman was a very powerful hero, but the reason he couldn't become an S-class hero was because of some problems with his personality and motivation.
Saitama was a very self-centered person. She had a very strong pursuit of her own strength, even at the expense of the interests of others. This kind of self-seeking performance often made him do some selfish actions, such as attacking other heroes or ignoring the safety of others in order to protect himself.
Saitama's personality also caused him to be unclear about some moral values. He did not care about the feelings of the other heroes. He only cared about whether he could become stronger. This kind of attitude often caused problems in teamwork because he did not understand the importance of teamwork.
In summary, Saitama's personality and motives were the main reasons why he could not become an S-class hero.
Eventually, the class might come to understand Marinette's decision. As they struggle to do things on their own, they realize how much effort Marinette had been putting in. This could lead to them changing their ways and maybe even trying to make it up to Marinette if she decides to start helping again.
Another plot could involve Saitama using his new S - Class status to reform the hero system. He might see all the flaws in it, like how some heroes are more concerned with fame than actually saving people. So, he starts making changes from the inside. He could introduce new training methods or even a new ranking system that focuses more on a hero's selfless deeds rather than just their power level.
Genos would probably be even more in awe of Saitama. He already idolizes him, but with Saitama being S - Class, Genos might see him as even more untouchable. He could become more protective of Saitama's new status, trying to fend off any detractors or those who might try to take advantage of Saitama.
They might be really excited, especially if the fanfiction contains interesting new storylines or character developments that they haven't thought of before.
Some students in Peter's class might be really excited as they get to see new takes on their favorite movie. Others could be a bit confused if the fanfiction is very different from the original story.
Well, some might be really amazed. They could see a new side of Deku that they never knew before. His singing might show a different level of confidence or a hidden talent, so they would probably cheer him on.