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.
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.
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.
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.
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.
The characters would likely have a mix of admiration and friendly rivalry. For example, the cool and collected protagonist of Persona 5 might be intrigued by the more laid - back nature of the Persona 4 protagonist. Meanwhile, the Persona 3 protagonist, with his more somber and serious demeanor, could initially seem a bit intimidating to the others. But as they get to know each other, they would start to bond over their shared experiences of fighting Shadows and protecting their worlds.
Joker, the main character of Persona 5, might be initially cautious around Kirby. Kirby's round and friendly appearance might make Joker lower his guard after a while. He could then show Kirby how to use a Persona, if Kirby was interested.
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.
Sii might interact with Genos in a mentor - like way. Since Genos is always looking to improve his powers, Sii could offer some unique insights based on their own abilities. For instance, Sii might tell Genos that sometimes the simplest solution is the best, which could change Genos' perspective on combat.
The characters would likely be initially cautious. For example, Yu from Persona 4 might be a bit reserved when meeting Joker from Persona 5, but as they learn about each other's goals, they would start to trust. Yosuke might be excited to see the more high - tech Metaverse compared to the TV World, and he could bond with Ryuji over their shared love for adventure. Chie would probably challenge Ann to a fight at first, thinking she's just a pretty face, but then realize Ann's strength.