The interactions would be complex. Harry, being from a world of magic, would introduce concepts that are completely foreign to Ranma and his friends. Cho would be the one to smooth things over when there are misunderstandings. Ranma would introduce Harry and Cho to the physical and cultural aspects of his world. They would all learn from each other. Harry could learn about martial arts determination from Ranma, while Ranma could learn about the power of magic from Harry. Cho could teach both of them about friendship and loyalty in different ways.
Well, it could be about Harry and Cho finding themselves in the world of Ranma. Maybe they get involved in Ranma's cursed spring adventures. They might have to help Ranma deal with his rivals while also trying to find a way back to their own world.
The female characters in Ranma 1/2, like Akane, might be a bit jealous of the Sailor Scouts at first. They're so beautiful and powerful. But then they could start to admire them and learn some things about confidence from them. The Sailor Scouts, on the other hand, would be curious about the strange relationships in Ranma 1/2, especially the whole fiancée situation. They might try to help sort things out in their own way.
If we consider Akane, she could potentially have some interesting interactions with the Sailor Scouts too. She might envy their grace and power at first. But then she could learn from them and in turn, teach them about her own strength in martial arts. And for the villains in the Sailor Moon universe, they would see Ranma and his friends as either a threat or a potential tool to use in their evil plans. They might try to manipulate Ranma's curse or use his skills for their own gain.
Ranma would probably be very confused at first when he enters the Highschool DxD world. He might be skeptical of the devils and angels. Issei, being a pervert, might be really interested in Ranma's female form. But Ranma would likely not tolerate Issei's behavior easily. Kuno from Ranma 1/2 might see the DxD characters as new rivals for Ranma's affections. And the female characters from DxD could be intrigued by Ranma's martial arts skills and his tough - yet sometimes clumsy - personality.
In a crossover, the characters might interact through a shared mission. Let's say there's a powerful villain that is causing chaos in both the Ranma and Sailor Moon universes. Ranma and the Sailor Scouts would have to put aside their differences and work together. Akane from Ranma's world could be jealous of Ranma's closeness to Sailor Moon, which would create some drama. Meanwhile, Sailor Mars might be suspicious of Ranma at first, thinking he could be a new enemy, but as they work together, she realizes he's an ally. This would lead to a development of their relationships.
Ranma is hot - headed and impulsive. He would probably clash with Sailor Moon's more emotional and sometimes naive personality at first. But over time, they could learn from each other. Ranma could teach her to be more assertive in a fight, while she could teach him to be more in touch with his feelings.
Chuck would probably be very curious about the magical abilities of the Harry Potter characters. He might be in awe of Dumbledore's wisdom and power. Harry, on the other hand, would be intrigued by Chuck's knowledge of the supernatural. They would start by asking each other a lot of questions. For example, Chuck would want to know how magic works, and Harry would be interested in Chuck's view of good and evil in his world.
Severus would be his usual brooding and sarcastic self. His distrust of others might initially cause friction with Bond, who is used to working in a team. Harry, on the other hand, would be more open - minded. He might be in awe of Bond's suave and confident nature at first. But as they get to know each other, Severus would start to respect Bond's skills and Bond would come to understand Severus's complex past and motives.
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.
Harry could interact with Belle in an interesting way. He would probably be intrigued by her love for books and knowledge, just like he is. They could share stories of their different worlds, with Harry talking about Hogwarts and Belle about her village. The Beast, on the other hand, might be initially suspicious of Harry, but as he sees Harry's good intentions, they could become comrades. For example, Harry could teach the Beast some basic self - defense spells in case of any future attacks.