The characters would likely have a mix of confusion and fascination. For instance, Harry Potter might be intrigued by the unique powers of the devils in High School DxD like Issei's Boosted Gear. On the other hand, the devils in DxD could be in awe of the complex magic system in the Harry Potter world. They would have to communicate and find common ground to work together, which could lead to some interesting cultural exchanges.
In a fanfiction, the characters could interact through a shared goal. Let's say there is a threat that endangers both worlds. Hermione from Harry Potter would use her vast knowledge of magic to come up with strategies. She would collaborate with the intelligent characters in DxD like Akeno. They would share ideas and combine their different forms of power. Harry and his friends would also learn about loyalty and friendship in a different way from the relationships in DxD, which could strengthen their own bonds.
Some characters might be initially hostile. Consider Draco Malfoy from Harry Potter encountering the devils in DxD. He might be judgmental and see them as 'dark creatures' similar to how he views werewolves and half - bloods in his own world. However, through various events, he could come to understand that they are not all bad. Meanwhile, Rias from DxD might find the Hogwarts students a bit naive in terms of combat compared to her own experience, but also recognize their value in terms of magic knowledge.
The Gryffindor characters from Harry Potter like Harry himself would probably be very bold and upfront when interacting with the characters in Highschool DxD. They might immediately jump into helping with any dangerous situations. Hermione, with her vast knowledge, could start analyzing the different powers and hierarchies in the DxD world. And Ron might be a bit more cautious but still curious.
The Power Rangers, being used to a more action - oriented and team - based dynamic, would likely bring their sense of discipline and cooperation to the interactions. They might be initially confused by the more chaotic and hormonal nature of the High School DxD characters. The High School DxD characters, on the other hand, would be intrigued by the Rangers' powers and technology. Issei, for example, might be eager to learn about the Rangers' combat skills and see if he could incorporate them into his own fighting style.
Ash would probably be curious about the devils and angels in High School DxD. He might try to befriend them with his friendly and innocent nature. The devils and angels, on the other hand, would be intrigued by Ash's Pokemon.
Well, Ben could use his alien forms to help out the characters in High School DxD in battles. For example, if there's a fight against a powerful devil, Ben could transform into Four Arms and use his super strength. The characters in DxD would be amazed by his abilities.
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.
Pit from Kid Icarus is very innocent and pure - hearted. He would be quite shocked by the more lust - driven characters in High School DxD like Issei at first. But over time, his positive attitude might influence Issei to be a bit more noble in his pursuits.
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.
The characters would likely have an interesting dynamic. For instance, Harry could show the Teen Titans how to use a wand and some basic spells. In return, the Titans could teach Harry and his friends some combat moves. Starfire's positive energy would probably contrast with the more somber atmosphere at Hogwarts sometimes. She could bring a bit of fun and light - heartedness to the wizarding students.
Harry Potter and Star - Lord would probably have an interesting dynamic. Harry is used to a world with clear rules of magic, while Star - Lord is more of a free - spirit in the vastness of space. They might initially clash but then learn from each other. Harry could teach Star - Lord about loyalty and the importance of fighting for what's right in a more selfless way, while Star - Lord could show Harry how to be more adaptable in new and strange situations.
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.