It would probably be Harry Potter himself. He's from a world full of magic and mystery, and seeing him interact with the very real and regal world of the Queen would be fascinating.
Definitely Harry and Gaster. Harry is used to the magic in his world, while Gaster has his own set of abilities. Their meeting would be full of confusion, curiosity, and perhaps a bit of wariness. Another interesting interaction could be between Hermione and Gaster. Hermione would be eager to learn about Gaster's knowledge and would probably bombard him with questions.
It really depends on the situation. If they are in the wizarding world, Harry Potter would likely be more dominant as he knows the ins and outs of magic and the wizarding society. He can use spells to his advantage and has a deep understanding of the magical threats. But if they are in Oliver Queen's world, in Star City, Oliver would be more in control. He knows the city, has his team, and his combat skills are more useful in a non - magical urban environment.
I think Harry Potter and Batman would have an interesting interaction. Batman is known for his intelligence and detective skills, and Harry has his own brand of cleverness and magical knowledge. They could compare notes on how to solve mysteries and fight crime in their respective worlds.
Hermione Granger and Spock would be really interesting. Hermione is known for her intelligence and knowledge. Spock is also highly intelligent and logical. They could have some really in - depth discussions about the differences between magic and science. Hermione could try to explain the principles of magic to Spock, and Spock could attempt to make Hermione understand the Vulcan way of thinking and the science behind the Enterprise's technology.
It's hard to say for sure, but it could be Harry Potter. His ability to perform a wide variety of spells, his experience in fighting dark wizards, and his connection to the powerful magic of love could give him an edge. Also, he has the support of his friends at Hogwarts who are also very skilled in magic. In a fight against the threats in the Percy Jackson world, he could quickly adapt his magic to deal with things like monsters.
Hermione and Sakura would be a great combination. Hermione is highly intelligent and book - smart, while Sakura is a skilled medical ninja with her own growth arc in terms of strength and confidence. They could exchange knowledge, with Hermione teaching Sakura about the complex magic theories and Sakura showing Hermione some of the medical ninjutsu. They could also work together to solve problems, using their combined wits and skills.
Hermione Granger and Weiss Schnee could be a great pair. Hermione is highly intelligent and studious, while Weiss is refined and also has a great deal of knowledge. They could bond over their love for learning and perhaps work together on some sort of magical - mechanical hybrid project. For example, combining Hermione's magic knowledge with Weiss' understanding of Dust to create something entirely new.
Hermione Granger and Sherlock would be an interesting pair. Hermione is extremely intelligent and well - read in magic. Sherlock is a master of deduction. She could introduce him to the complex world of magic, and he could help her with his logical thinking when it comes to non - magical mysteries at Hogwarts. They could also have some really interesting debates about the nature of knowledge, whether it's through magic or pure logic.
I think Hermione would be really interesting too. She is so intelligent and knowledgeable about magic. When she meets Captain America, she would probably be very curious about his world and how things work without magic. She could be the one to try and find a way to bridge the gap between the two worlds, like trying to figure out how Muggle technology and magic could work together.
The interaction between Hermione and Carlisle would be really interesting. Hermione is super intelligent and always eager to learn, and Carlisle is a very old and knowledgeable vampire. They could have deep discussions about the nature of life, death, and immortality. Hermione might be fascinated by how Carlisle has managed to retain his humanity over the centuries, while Carlisle could be intrigued by Hermione's vast knowledge of magic and her strong moral compass.