In a fanfiction, perhaps Batman tries to find a way to measure Saitama's strength scientifically. He might use his advanced technology to analyze Saitama's punches. Saitama, being the simple - minded hero he is, would just go along with it, not really understanding the purpose but being friendly about it.
One possible scenario in Batman and One Punch Man fanfiction could be a battle of wits between Batman and Saitama. Batman, with his strategic mind, would be intrigued by Saitama's overwhelming strength. Saitama, on the other hand, might be confused by Batman's complex gadgets and plans.
Yes, there are some great crossovers. In these fanfictions, you might see the Phantom Thieves from Persona 5 teaming up with Saitama from One Punch Man. They could be facing a common enemy that has characteristics from both the metaverse in Persona 5 and the strange monsters in One Punch Man. For example, a powerful shadow-like being that can only be defeated by a combination of the Thieves' Personas and Saitama's strength.
A fanfiction could show Saitama getting lost in Gotham. Batman finds him and is immediately on guard because of Saitama's strange appearance. But when Saitama just asks for directions in his usual bland way, Batman is a bit taken aback.
A great aspect of One Punch Man One Piece fanfiction is exploring how the different power systems interact. One Piece has devil fruits, haki, and various fighting styles, while One Punch Man has Saitama's overwhelming strength. Fanfiction can delve into how characters from each series would adapt if they were suddenly in the other's world. For example, if Zoro were to face a monster in the One Punch Man world, he might initially struggle with the different types of threats but then find ways to use his swordsmanship and haki in new and creative ways.
One popular aspect in One Punch Man subterranean fanfiction is the re - imagining of the subterranean races. Writers often give them more complex backstories and motives. For example, some fanfics might depict a subterranean character who has a change of heart and decides to side with the surface - dwellers. This adds an interesting layer of depth to the story as it challenges the traditional view of the subterranean as simply enemies in the original work.
One Punch Man's heroes in the Marvel universe could also be a cool concept. For instance, Mumen Rider's sense of justice in a world full of super - powered beings like in Marvel. His simple yet strong - willed nature could inspire some of the street - level heroes in Marvel. And then there's Tatsumaki, her psychic powers could put her in some interesting situations with the likes of Doctor Strange, as they both deal with powerful and otherworldly forces.
Well, a great crossover idea is having the villains from One Punch Man enter the Naruto universe. For instance, Boros arriving in Konoha. The ninjas would be in for a huge shock as they've never faced an enemy as powerful as him. And Naruto would have to think of some really creative ways to defeat him. Also, the idea of Tsunade trying to figure out how to heal Saitama if he ever got 'injured' (which is highly unlikely) could be a humorous and interesting plot point in a fanfiction.
One interesting crossover could be Saitama from One Punch Man meeting Ichigo from Bleach. Imagine Saitama's nonchalant attitude in the face of Bleach's complex spiritual world. He might just punch away Hollows without breaking a sweat, while Ichigo would be both amazed and a bit frustrated at Saitama's overpowered nature.
Another idea is a family - like bond forming between the characters. The Parr family could take Saitama in as an honorary member. Dash would be constantly trying to race Saitama, while Violet would be a bit shy around him. And Jack - Jack could be really curious about Saitama's bald head.
One interesting crossover could be Saitama from One Punch Man meeting Ichigo from Bleach. Saitama's overpowering strength would contrast with Ichigo's growth - based power. Maybe Saitama could accidentally disrupt a Hollow attack that Ichigo was about to face, leading to some comical misunderstandings as Ichigo tries to figure out who this bald - headed, super - strong guy is.
Yes, there could be crossovers where RWBY characters are inserted into the One Punch Man universe. For example, Ruby's speed could be compared to Saitama's in some action - filled scenes. RWBY might enjoy seeing how their powers interact with the crazy power levels in One Punch Man.