Well, Nick Wilde from Zootopia is a sly character. He might be able to adapt to the GTA 4 world more easily than some of the others. He could use his wits to blend in with the criminal underworld, perhaps even using their own tricks against them. In Zootopia, GTA 4 characters would have to adapt to a world where physical strength isn't always the most important factor. They might be surprised at how the Zootopia animals use their intelligence and unique abilities to solve problems and get by in their society.
The GTA 4 characters are used to a more human - centric, urban and often gloomy world. When they enter Zootopia, they would need to adjust to the different species, cultures and the fact that everyone is an animal. For example, they would need to learn about the different habitats and how the animals have built their society around that. In reverse, Zootopia characters in GTA 4 would have to be very cautious as the world is full of danger. They might have to learn how to defend themselves in a more aggressive way compared to their own world.
The characters from Skyrim, like the Nords, are used to a cold and harsh environment. In the world of Game of Thrones, they might find the politics of Westeros very complex. However, their combat skills would be useful. For example, a Nord warrior could easily adapt to being a sellsword in Westeros. The characters in Game of Thrones, on the other hand, would be amazed by the magic in Skyrim. A character like Tyrion Lannister might be very interested in the Dwemer technology and magic.
The Terrans from Starcraft would find the Pandora planet in Avatar very challenging. Their reliance on technology might not work as well in the lush and often unpredictable environment. They would have to learn to adapt to the natural cycles and the power of Eywa. The Na'vi, on the other hand, would be shocked by the mechanical and technological warfare of the Terrans. They might initially resist but could eventually learn to use some of the less harmful tech for their own benefit. For the Protoss, they would be intrigued by the spiritual connection in Avatar. They might try to find parallels in their own beliefs and use their psychic abilities to communicate with the natural forces on Pandora.
The characters from Dark Souls are used to a world full of danger and death around every corner. In Game of Thrones, they would likely find the political intrigue and backstabbing to be just as dangerous as any monster. For example, a Dark Souls knight might initially be confused by the complex web of alliances and betrayals in Westeros but would soon learn to navigate it with their combat - hardened instincts.
Well, consider Elsa from Frozen. If she were in the Fallout world, her ice powers could be used to preserve food in the wasteland, which is a very practical adaptation. She would also need to adapt to the violence and danger, perhaps using her powers defensively more often. The people in the Fallout world would need to adapt to her presence. Some might see her as a savior, while others might be afraid. Now, if a Fallout character like the Courier was in Arendelle, they would need to adapt to a more structured society. They would have to learn the rules and customs, and also deal with the magic which is completely foreign to them. Anna would likely be the one to help the Courier adjust, as she is very friendly and open - minded.
Percy would probably have a tough time at first in the Warhammer world. The chaos and the different races would be quite a shock. But his ability to adapt quickly, which he learned from his many quests in his own world, would help. He'd start using his powers in new ways, like using water to put out the fires of the Dwarven forges when they go out of control. Annabeth would be studying the architecture and the different battle strategies of the Warhammer races, and try to incorporate them into her own knowledge base.
The wizards from Harry Potter would be in awe of Narnia's magical creatures. Harry, for instance, would be fascinated by Aslan. He'd probably see Aslan as a powerful and wise being, much like Dumbledore. On the other hand, the Narnians might be a bit scared of some of the dark magic in the Harry Potter world. For example, the Dementors would be a terrifying sight for them.
Judy Hopps would likely adapt quickly. She's used to facing challenges in Zootopia, and in Warhammer, she'd just see it as a new set of problems to solve. Nick Wilde, on the other hand, might take a bit more time as he'd have to figure out who to trust. He'd probably start by using his charm to make connections.
The FNAF characters, if they were to enter the My Hero Academia world, would be very out of place. However, the animatronics' durability could be seen as a form of 'quirk' in that world. The heroes would have to figure out how to contain or deal with them. And the My Hero Academia characters would have to adapt their fighting styles to deal with these strange new opponents. For instance, Midoriya might try to find a non - violent way to subdue the animatronics at first, but if that fails, he'd have to use his full power.
Batman would find the world of Death Note very disturbing. The concept of the Death Note and the power it holds over life and death is something that goes against his sense of justice. He would be on a mission to stop anyone from misusing it. On the other hand, Light from Death Note might see Batman as a threat to his grand plan. Batman's reputation for thwarting criminals would make Light view him as someone who could expose his secret and put an end to his 'new world' vision.
The female Percy Jackson is used to a life of adventure and constantly being on the move. Apollo, as a god, has his own routine in Olympus. In the fanfiction, for them to adapt to each other, Percy might introduce Apollo to the more 'human' side of things, like enjoying a simple meal by the beach or going on a hike without any godly powers. Apollo would have to learn to value these simple pleasures. And Apollo could introduce Percy to the more refined aspects of godly life, like celestial music and art. They would both have to make compromises to make their relationship work.