In a fanfic, their interaction could be quite complex. Harry, being used to a more structured magic system, would be intrigued by Elsa's intuitive and emotional - based ice magic. Elsa, who has always been somewhat alone with her powers, would find Harry's knowledge of magic and his group of friends appealing. They could start to train together, with Harry teaching Elsa some basic spells and Elsa showing Harry how to better control his emotions when using magic, as she has learned to do with her ice powers.
Harry might be in awe of Elsa's powers at first. He would likely approach her with caution and respect, as he does with most powerful beings. Elsa, on the other hand, would be curious about Harry's world of wands and spells. They could start by sharing their stories. Harry would talk about Voldemort and his battles, and Elsa would share her experiences with her frozen kingdom and her isolation.
The two characters would interact in a very interesting way. Since Harry is a hero in his own right, he would see Elsa as an equal. Elsa, who has always been a strong and independent character, would respect Harry's courage. They could exchange magical knowledge. For instance, Elsa could teach Harry how to create ice shields using his magic, and Harry could show Elsa how to use magic to create illusions, which could be useful for her in protecting her kingdom. Their interaction could also lead to a deeper understanding of their own selves as they learn from each other.
Hermione would likely be very curious. She'd want to research all about Elsa and how her powers work in relation to Harry's wizardry. Ron, on the other hand, might be a bit more cautious at first. He'd probably make some jokes about Harry being part ice - prince or something. Dumbledore would be very intrigued. He'd see Harry's new powers as an asset in the fight against evil. He might even offer to help Harry explore and control his ice powers better.
The characters would interact in very strange ways. The Hogwarts students would be shocked by the Jackass crew's behavior. The Gryffindors might be initially intrigued, while the Slytherins would be disdainful. Harry and his friends would probably try to keep the Jackass guys out of trouble, but it would be difficult as they are always looking for the next wild thing to do.
Harry might be initially terrified but then use spells like Stupefy to try and stun the Xenomorphs. Hermione would probably research about them in the Hogwarts library to find a more permanent solution.
Harry would likely be both curious and cautious when interacting with Death. He might ask Death many questions about the meaning of life and death in the wizarding world. Other characters like Hermione and Ron, if they are involved, would probably be very worried about Harry's interaction with Death and try to protect him or convince him to stay away.
Harry Potter would probably be initially cautious around She - Hulk. He's used to magic and magical creatures, but She - Hulk is a whole new level of different. However, as he gets to know her, he would respect her strength and her sense of justice. She - Hulk, on the other hand, would be amazed by the magic in the wizarding world. She might try to learn some spells and would be very protective of Harry and his friends, just like she is in her own world.
Jacob would likely be very direct and physical in his interactions, while Harry might be more cautious and cerebral. Jacob could introduce Harry to the world of werewolves, and Harry could show Jacob the magic of the wizarding world. They might start off being a bit suspicious of each other, but as they face challenges together, they would grow to respect and rely on one another.
Hikaru is very observant, which could be useful in the wizarding world. He might notice small details about the magic around Hogwarts that Harry has overlooked. In return, Harry could teach Hikaru more about the serious aspects of magic, like defense against the dark arts. Their interactions would be a mix of cultural exchange, with Hikaru sharing his Japanese school experiences and Harry introducing the wizarding world traditions, and also a combination of their different personalities clashing and then meshing together as they face various challenges at Hogwarts.
The interaction could be initially very tense. The Prime Minister might be skeptical and afraid of Harry Potter and the magic he represents. But as the story progresses, he would start to see Harry as an ally. For example, Harry might have to perform some magic in front of the Prime Minister to prove the existence of the wizarding world, and the Prime Minister would be both amazed and a bit intimidated. Later, they would communicate more freely, with Harry explaining the ways of the wizarding world and the Prime Minister sharing his concerns about how magic can impact the Muggle society.
Harry Potter himself would be likely to interact with Elsa. Given his own experiences with unique powers and his role as a hero, he would be sympathetic to Elsa's situation. They could bond over their shared sense of responsibility and their ability to do things that others can't. Harry could also introduce Elsa to his friends and the world of Hogwarts.
The characters would have very different cultures and ways of life. For example, the Hobbits are used to a simple, rural life with lots of food and comfort. The Hogwarts students might find this quite strange at first. But they would soon realize that the Hobbits' simple ways also hold great wisdom. Frodo, being a brave Hobbit, would likely be respected by Harry Potter for his courage in carrying the One Ring. Harry, in turn, could show Frodo some of the amazing magic in the wizarding world.