Hermione would likely be very eager to research the Soul concept from Madara's world. She would pour over books and try to understand the theory behind it. She might even try to create spells or potions based on this new knowledge. For instance, she could try to develop a spell that protects the soul in a more comprehensive way, inspired by Madara's understanding of the soul.
Harry himself could have an encounter with the Soul concept from Madara's world. Maybe he travels to a different dimension where he meets someone who explains Madara's view of the soul. Harry, with his strong sense of right and wrong, might be both intrigued and a bit horrified. He could then try to bring back some knowledge about protecting the soul in a more effective way to his own world, to use against Voldemort.
A vampire from Harry Potter in the Tokyo Ghoul world could have an interesting role. Since vampires in Harry Potter are often depicted as having a certain allure and charm, they could potentially use this to their advantage when interacting with both ghouls and humans. They might be able to charm some of the weaker - willed humans into helping them, or even some of the more desperate ghouls. However, they would also face danger from the more powerful ghouls and the CCG. Their vampire nature might make them a target for the CCG, who would see them as another non - human threat. And if they got involved in the power struggles between different ghoul groups, they could find themselves in a very precarious situation, having to use their wits, magic (if applicable), and vampire abilities to survive.
Ron would probably be more wary and hostile towards Sephiroth at first. He might see Sephiroth as a threat right away, especially if Sephiroth showed any signs of aggression. Ron would rely on his Gryffindor courage to stand up to him, but his insecurities might also surface. However, as the story progresses, he could learn from Sephiroth's power and maybe even develop a grudging respect if Sephiroth had any redeeming qualities.
Hermione might interact with Lena Luthor by being initially skeptical of her scientific knowledge. But as they start to work together, Hermione would come to respect Lena's intelligence. For example, if they were trying to solve a problem that combined magic and technology, Hermione's vast magical knowledge and Lena's tech - savvy would complement each other.
Hermione would likely be very interested in Shikaku Nara's strategic thinking. She would pester him with questions about how he plans and analyzes situations, and they could end up having long discussions about the similarities and differences between magic and ninja skills when it comes to problem - solving.
The characters could board the Flying Dutchman. For example, Harry, Hermione, and Ron could be on a quest and find the ship. They might be initially scared by its spooky appearance but then realize they need to work with the crew. Hermione could use her vast knowledge of magic to communicate with the ship's magic, while Ron might be more hesitant but still offer his loyalty and strength.
Well, Daryl could teach Harry how to track. Harry has his magic to sense things, but Daryl's skills are all about the physical world. They could be in a situation where they need to find a missing person or a hidden object. Daryl would show Harry how to read signs on the ground, and Harry could use his magic to enhance Daryl's senses for a short time.
Well, Hermione could be really intrigued by Doctor Strange's library. She might ask him all sorts of questions about the books and scrolls he has, and they could exchange knowledge about different magical concepts. For example, Hermione could learn about the use of astral projection from Strange, and in return, she could teach him some of the more complex spells from the wizarding world.
The characters could interact through magic exchanges. For example, Hermione could be fascinated by the magic of the ponies, which is so different from the wizarding magic she knows. She might try to study it and figure out how it works. In return, Twilight Sparkle could be interested in the books Hermione reads and learn about wizarding knowledge.
Well, Gabriel could be a key figure in helping Harry Potter understand some of the deeper mysteries of magic. Since Gabriel has a different kind of power in the Supernatural world, he could show Harry that there are other ways to use magic that are not taught at Hogwarts. For instance, he could teach Harry how to use magic to manipulate time on a small scale, which could be useful in Harry's fight against the Dark Arts. And Harry, in turn, could introduce Gabriel to the rich magical culture and history of the wizarding world, like the story of the four founders of Hogwarts or the origin of the Hallows.
Well, Hermione might study the Kusanagi no Tsurugi. She'd be fascinated by its history and magic. She could try to decipher any inscriptions on it using her vast knowledge of ancient languages. Maybe she'd find a connection between the magic in the sword and some of the lost spells in the wizarding world.