Garou from OPM might also work well. His ideology of being a 'human monster' and his constantly evolving strength could make him a formidable foe for Saitama. Their clash could be not only about physical strength but also about their different views on what it means to be a hero or a monster.
Another interesting concept is a crossover where the villains from the OPM world are a threat to Saitama's own world. Saitama then has to team up with the OPM heroes to fight back. This could lead to some really cool fight scenes and interactions between different characters.
One idea could be that Saitama from OPM ends up in the RWBY world and participates in a Grimm - slaying tournament. His overwhelming strength would shock everyone, and he might just be in it for the free food at the event.
Well, some fanfictions about Mosquito Girl in OPM can be really creative. They often explore her backstory more deeply, like how she became the way she is. It gives fans a chance to see different sides of her character that might not be shown in the original work.
Metal Bat in One - Punch Man (OPM) fanfiction often has his character explored in various ways. Some fanfictions might focus on his backstory, like his relationship with his sister. In fan - made stories, he could be depicted in new battles, showing off his strength and his unwavering determination even more intensely than in the original manga or anime.
For example, if Saitama from OPM and Yang from RWBY were to fight together. Yang's semblance of getting stronger with each hit she takes could be interesting when combined with Saitama's already extreme strength. Saitama could observe Yang's fighting style and be impressed by her tenacity.
Some popular platforms for reading OPM (One Punch Man) fanfiction are Archive of Our Own (AO3) and FanFiction.net. AO3 has a large and diverse collection with a well - organized tagging system, making it easy to find specific types of OPM fanfics. FanFiction.net also has a significant number of OPM fan - created stories, though the interface might be a bit more basic compared to AO3.
Yes, the OPM manga has come to an end. The creators completed the narrative, providing closure to the fans. Although some might have hoped for more, what was presented was a comprehensive and conclusive tale.