They might interact as allies. For instance, Itachi's combat skills and strategic mind could help Harry in battles against Voldemort's forces. Harry, in turn, could introduce Itachi to the magic of the wizarding world, like spells that could enhance Itachi's abilities further.
In some fanfics, they could be rivals. Itachi, with his powerful Sharingan, might see Harry as a threat to his own goals in the wizarding world. This could lead to intense duels between them, where Harry uses his magic and Itachi his ninja skills. But over time, they could come to understand each other's motives and end up working together.
Hermione Granger is a very common character. Since she is Harry's best friend, she would likely be there to help him understand and control his new superpowers. She might research in the library to find out how these powers came about and how to use them effectively. Ron Weasley is also common. He would probably be both in awe and a bit jealous of Harry's new powers at first but would still support him in the end.
Often, in fanfiction, Itachi's calm and collected demeanor contrasts with Hinata's more timid nature. This contrast can lead to some interesting dynamics. For instance, Itachi might encourage Hinata to be more assertive, while Hinata could show Itachi the beauty in simple things, like the flowers in Konoha. Their relationship might grow as they learn from each other.
Harry would likely be very suspicious of The Joker from the start. He's used to dealing with threats in his own world, and The Joker's erratic behavior would set off alarm bells. Hermione would probably try to study The Joker, looking for a logical explanation for his actions and a way to counter him. Ron, on the other hand, might be a bit more fearful at first but would still stand by his friends. They would initially approach The Joker with caution, trying to figure out if he has any magical abilities or if he's just a very strange Muggle who has found his way into their world.
She might interact with Hermione in a way that challenges Hermione's logical view of relationships. Aphrodite could introduce her to a more emotional and instinctive side of love. They could have conversations about how love is not always something that can be explained by books or logic, and this could lead to Hermione having a different perspective on her own feelings for Ron or other potential partners.
They could interact through a magical portal that connects their two worlds. For instance, Supergirl could be curious about the magic in Harry's world and visit Hogwarts. She might use her superpowers to help in a Quidditch match, like flying really fast to catch the Golden Snitch before any of the players. Harry, on the other hand, could visit Metropolis with Supergirl and be amazed by the tall buildings and advanced technology.
Hermione would be very interested in studying Rapunzel's hair magic. She would want to research if it could be related to any known magic in the wizarding world. Rapunzel would be eager to learn from Hermione's vast knowledge of spells and potions. Ron might be a bit skeptical at first, but as he sees the practical uses of Rapunzel's hair, like using it to rescue someone from a high place, he would start to accept her and her magic. And together, they could face challenges like fighting off dark creatures or solving magical mysteries.
Sansa, with her refined manners, would initially seem a bit out of place among the more casual Hogwarts students. However, Harry would see past that and recognize her strength. They could interact in a way that Sansa teaches Harry about diplomacy and strategy from her own experiences in Westeros. Harry, on the other hand, could introduce Sansa to the concept of magic as a tool for good. Their interactions would also be shaped by their shared experiences of facing difficult situations and having to make tough decisions. They might even compare notes on how to deal with enemies like the Death Eaters and the Lannisters.
Harry might be initially cautious about the Triforce. He's used to his wand and magic, so this new, unknown power would be a bit intimidating. But his sense of right and wrong would lead him to explore its potential for good. He would likely try to use it to protect his friends and defeat Voldemort.
One way for them to interact is if a wizard from the Harry Potter world has a special interest in the magic of Mowgli's jungle. This wizard could send Harry on an expedition there. When Harry arrives, Mowgli sees him as a strange intruder at first. But as Harry shows his good intentions, they start to work together. Mowgli could introduce Harry to the different parts of the jungle, and Harry could share stories of his adventures at Hogwarts. As they spend more time together, they realize that they can help each other. For instance, Mowgli's animal friends could help Harry find a rare magical plant in the jungle, and Harry could use magic to protect the jungle from a group of poachers who are after some of the magical animals.
Android 18 could be a protector for Harry. Given her strength, she could easily fend off Death Eaters. Harry, in turn, could introduce her to the magical world, showing her spells and potions. For example, she might be amazed by the invisibility cloak and they could use it for some strategic advantage.