Harry and Rikuo could start off as cautious around each other. Harry, not used to yokai, and Rikuo, not knowing much about wizards. But as they face common enemies, they would start to trust and rely on each other. Harry could teach Rikuo some basic spells, while Rikuo could show Harry how to use his yokai powers more effectively in combat situations.
Ron might be a bit more hesitant and scared of the yokai at first. But when he sees how the Nura Clan members are actually friendly (most of them) and how they are fighting against evil, he would warm up to them. He could share his Weasley family's tales of adventure and magic with the Nura Clan members, and in return, they could tell him stories of their own heroic deeds.
In a fanfiction, Hermione would probably be very interested in studying the Guardians. She might ask a lot of questions about their origin and powers. Meanwhile, Santa Claus from Rise of the Guardians could be impressed by the loyalty and courage of the Hogwarts students. He could offer them some of his special gifts or knowledge to help in their fight against evil. Harry, on the other hand, might feel a connection with Jack Frost as they both have a sense of being different and having a special destiny.
One possible plot could be that Harry Potter somehow gets transported to the world of the Nura Clan. He might initially be confused by the yokai and their ways. But with his magical skills, he could help the Nura Clan in their battles against other dark forces. For example, he could use his Patronus to fend off some particularly menacing yokai threats.
Harry Potter would likely be in awe of Hercules' strength at first. He might be a bit cautious too, as Hercules is from a different world of gods and myths. But they would probably quickly become friends as they both have a strong sense of justice. Hermione would be very interested in Hercules' stories about the Greek gods and would constantly ask him questions, trying to learn as much as she could.
Harry would probably be cautious at first. He's used to the magic in his world, and an Imperial Arm would be something new. He might study it carefully, like he does with new spells. Hermione would be all about researching it, looking for any information she could find. Ron might be a bit more skeptical, but still curious. They would all approach it with the mindset of trying to understand how it fits into their world of magic.
Moana would likely be curious about the magic in Harry Potter's world. She might ask Harry to show her some spells, like the levitation charm. Harry, on the other hand, would be impressed by Moana's courage and her ability to sail across the ocean. He could learn from her about determination. Hermione might study the culture of Moana's island, and Moana could learn about Hermione's love for books and knowledge.
The characters would have very different worldviews. For example, the wizards in Harry Potter are used to a world where magic solves many problems. But the Firefly crew has to rely on their wits, technology and sometimes brute force. So there could be initial misunderstandings. Harry might try to use magic to fix a broken part on the Firefly ship, but Mal might not trust this strange 'power' at first.
Dumbledore would be a wise figure for Eragon to meet. Dumbledore could offer insights into different types of magic and how to use them for good. Eragon would respect Dumbledore's knowledge and power. In return, Eragon could share with Dumbledore the ways of his own magic, which is more nature - based. Voldemort, if he were still around in this crossover, would see Eragon as a threat because of his unique magic and his dragon. Eragon would not tolerate Voldemort's evil ways and would be ready to fight him alongside Harry and his friends.
In a crossover, characters would interact in interesting ways. For instance, the magic in Harry Potter is more about spells and potions, while Rapunzel's magic is in her hair. When they meet, characters like Hagrid from Harry Potter might be really interested in Rapunzel's hair as it is a very unique form of magic. Rapunzel could learn about the different magical creatures in Harry Potter's world from Hagrid. Meanwhile, the villains would also interact. Mother Gothel could potentially team up with some of the dark wizards from Harry Potter. However, the heroes like Harry, Hermione, Rapunzel and Flynn would have to put aside their differences in magic and upbringing to fight against this combined evil. They would learn from each other's strengths, for example, Rapunzel's kindness and ability to see the good in people could influence Harry, and Harry's determination in the face of great evil could inspire Rapunzel.
Well, Harry Potter could meet Mickey Mouse. Mickey might be curious about Harry's wand and Harry could be fascinated by Mickey's magic in a different way. Hermione would probably have in - depth discussions with Belle about books and knowledge. Ron might be a bit intimidated by the larger - than - life Disney characters at first but then warm up to them. Hagrid could get along well with the talking animals from Disney movies, sharing stories about magical creatures.
Harry Potter and his friends would be both shocked and intrigued by the Addams family. Ron would be constantly freaked out by their strange habits, like Gomez's love for knives and Morticia's long black hair that seems to have a life of its own. Hermione, however, would be eager to learn about their family magic, if they have any. She might try to study it like she does with other forms of magic in the wizarding world. And Harry would probably be a bit cautious but also curious, seeing as he has his own experience with dark and strange things.