I think Ron Weasley and Scotty would be great to focus on. Ron is often the comical relief in the Harry Potter series. Scotty is known for his Scottish charm and his love for the Enterprise's engines. They could get into all sorts of hijinks together. Maybe Ron accidentally messes with some of Scotty's engine controls with his clumsy ways, or Scotty tries to teach Ron how to fix things in a more technological way instead of using magic.
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.
Hermione Granger and Batman would be great to focus on. Hermione is extremely intelligent and well - read in the magical lore. Batman is a brilliant detective with a vast knowledge of various sciences and combat skills. Their interaction could be really engaging. Hermione could introduce Batman to the world of magic, and Batman could show Hermione how to use her intelligence in a more practical, non - magical way in different situations. Also, Wonder Woman and Ginny Weasley could be an interesting pair. Wonder Woman with her Amazonian strength and Ginny with her powerful magic could team up and have some great adventures together, sharing their different perspectives on heroism.
Leonidas from '300' would be a great character to focus on. Imagine his reaction to the magic of the Harry Potter world. He's a fearless leader, and seeing him interact with wizards and magical creatures would be fascinating. He might see the magic as a new weapon or a strange form of sorcery that he has to either embrace or fight against.
I think Harry Potter himself would be very interesting. He has a whole new world to discover in the world of Shadow the Hedgehog. His reactions to the high - speed action, different technology, and the new types of enemies would be really cool to explore. Also, his magic would be a unique element in that world.
One possible plot could be that the Hogwarts students are on a field trip when they accidentally stumble into the world of the Enterprise. Harry and his friends could help the Enterprise crew deal with a magical threat that the crew's technology can't handle. For example, a dark wizard has created a spell that is causing chaos on the Enterprise and only magic can reverse it.
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.
Luna Lovegood would be an unexpected but fascinating choice. Her unique perspective and belief in all kinds of magical creatures could make her very open - minded about the vampires and werewolves in the Twilight world. She might see them as just another type of magical being and try to find common ground, which could lead to some really interesting interactions and storylines.
Harry himself would also be a great focus. His experience with facing dark wizards in his own world would be put to the test in the Forgotten Realms. He could have to learn new magic quickly to survive and also figure out how to use his existing powers in a world with different magical rules. His connection to Voldemort might also play an interesting role, like if Voldemort's influence somehow seeps into the Forgotten Realms.
Hermione would be really interesting. She's so intelligent and studious. If she traveled back in time, she could use her knowledge of magic history and spells to make a big impact. For example, she might be able to help the Order of the Phoenix in new ways during the First Wizarding War or she could introduce some modern magical concepts to the wizards of the past.
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.
Definitely Snape. His complex character with his love for Lily and his role as a double agent has so much potential for exploration through memories. Harry himself is also interesting as his memories can uncover more about his family and his own growth. And Dumbledore, his past is full of mystery and his memories could reveal many secrets about his actions and motives.