Saitama's one - punch ability would completely overpower most of the beings in the Overlord world at first glance. However, Ainz has a vast array of magic and strategic abilities. He could potentially use his knowledge of magic and the terrain in the Overlord world to his advantage against Saitama, even if he couldn't defeat him directly. For example, he could create illusions or traps.
The monsters in One Punch Man are often strange and powerful in their own right. When brought into the Overlord world, they could cause chaos. Some of the lower - level monsters in Overlord might not be able to handle the unique abilities of One Punch Man's monsters. And the higher - level beings in Overlord would have to use their complex magic and strategies to deal with them. Meanwhile, Saitama would just be casually punching them out of existence if they got in his way.
The heroes in One Punch Man, like Genos, have advanced technology - based abilities. In the crossover, they could potentially interface with the magic - based technology in the Overlord world in interesting ways. Genos might be able to analyze and adapt to the magic systems, or even find ways to combine his tech with magic for new and unexpected abilities.
The interactions would be quite diverse. Thor might see Saitama as a strange but powerful being. He could offer to have a friendly sparring match, which Saitama might decline because it's too much trouble. Black Widow would likely be trying to figure out Saitama's background and what makes him tick. And Spider - Man would be super excited to meet someone with such incredible power, constantly asking Saitama questions about how he got so strong.
In a crossover, Saitama might be the odd one out in the colorful and ink - filled Splatoon world. But his simplicity and straightforwardness would attract the inklings. They would try to get him to embrace their culture, like trying different ink colors. Saitama would just go with the flow. Genos, on the other hand, would be more focused on how the Splatoon world could help him become stronger. He would observe the inklings' and octolings' teamwork during battles. The inklings and octolings would be fascinated by Genos' loyalty to Saitama and might try to understand the concept of a master - apprentice relationship in the context of their own social structures.
Saitama and Naruto would have a rather comical interaction. Naruto is very talkative and enthusiastic, always ready to make friends. Saitama is the opposite, very laid - back and not overly expressive. Naruto would probably be constantly trying to engage Saitama in conversations about power and heroism, while Saitama would just be like 'yeah, whatever'. But when it comes to fighting together, Naruto's quick thinking and Saitama's brute force would complement each other well.
Teruki Hanazawa from Mob Psycho 100 could be really interesting in a crossover. He might initially see Saitama as a rival, thinking that his strength is just another form of power that he can compete with. But as he gets to know Saitama better, he realizes that Saitama's power is on a whole different level. Saitama, in turn, would probably just be like 'oh, another guy with powers' and not be too fazed. And when it comes to characters like Genos from One Punch Man, he might be very curious about Mob's psychic abilities and try to analyze them scientifically.
Imagine Pinkie Pie meeting Saitama. Pinkie would be her usual bouncy self, trying to throw a party for him. Saitama would be a bit bewildered by her energy. Fluttershy might be a bit scared of Genos at first because of his robotic appearance, but then she would realize he's not a bad guy. The ponies' way of solving problems through friendship and cooperation would be a new concept to Saitama and Genos. They would learn a lot from each other. For example, Saitama could learn about the importance of having a positive community like the ponies do, and the ponies could learn about self - defense from Saitama and Genos.
Well, Naruto's shadow clone jutsu could be really useful in a fight alongside Saitama. The clones could distract enemies while Saitama gets in a powerful punch. And Saitama's super strength could help Naruto in situations where brute force is needed more than ninjutsu. For example, if they had to break through a really thick and magically reinforced wall.
The plot could involve Saitama from One Punch Man being transported to the world of Overlord. He might initially be confused by the different magic - based setting. Since Saitama is so overpowered, he could end up accidentally causing chaos in the new world. For example, he might punch an enemy so hard that it creates a massive crater, which the inhabitants of the Overlord world have never seen before.
The interaction could be full of humor and action. Imagine Skull from Persona 5 challenging Saitama to a fight, not fully understanding the extent of Saitama's power. Saitama would probably just knock him out with one punch in a comical way. But then the Persona 5 characters could show Saitama the value of teamwork and strategy, which he might not be used to in his solo fighting style. They could also introduce him to their world, and Saitama could introduce them to the strange and wacky world of One Punch Man heroes and villains.
For example, if we consider Frozone's ice - making ability and Genos' fire - based attacks in a fanfiction context. They could create a really unique balance. Genos could provide the heat source and Frozone could use his ice to direct and shape it into powerful ice - fire attacks. Also, Elastigirl's stretching ability could be used in combination with Tatsumaki's telekinetic powers. Elastigirl could stretch out her limbs and Tatsumaki could use her telekinesis to fling Elastigirl around like a weapon, reaching far - off enemies.
Saitama and Albedo would have really interesting interactions. Albedo is so devoted to Ainz in Overlord, and when she meets Saitama, who is just this nonchalant super - powerful guy, she would be both confused and perhaps a bit threatened. Saitama, on the other hand, would just see her as another person in this strange new world.