The Son of Thor OC would likely have a complex relationship with the main characters. With Rias, he could start off as an enigma. She'd be curious about his powers and his motives. He might be a bit of a wild card in her plans for her peerage. And with the other characters like Akeno, he could have some flirty interactions as she's attracted to powerful beings. But overall, his interactions would depend on how his character is written, whether he's more of a brash, power - hungry type or a more noble, heroic type.
If Spawn were to interact with the main characters, he would bring a whole new level of seriousness. He has a dark past and a lot of baggage. When it comes to Issei's goal of becoming a harem king, Spawn might find it absurd but also interesting in a way. He could offer his own perspective on power and how to use it responsibly, which would be a contrast to the more carefree attitude of some of the Highschool DxD characters. And with the other characters like Akeno and Koneko, he'd be sizing them up, trying to figure out if they're threats or allies.
Well, it could be about the OC, as the son of Thor, coming to the Highschool DxD world and showing off his godly powers. Maybe he'd have to deal with the various factions in the school, like the devils, angels and fallen angels, while also trying to fit in.
The female characters from Highschool DxD, like Rias, would be intrigued by the unique personalities of the Naruto characters. Rias might see potential in some of them to join her peerage. And the Naruto girls, like Sakura, would be a bit shocked at first by the more revealing outfits and flirty nature of some of the Highschool DxD characters. But over time, they would bond over things like protecting their friends and the school. The Naruto boys would respect the power of the Highschool DxD devils and might even try to incorporate some of their fighting strategies into their own ninja combat styles.
Well, characters like Naruto, with his friendly and determined nature, would likely befriend some of the Highschool DxD characters quickly. He might be curious about the different species in their world. And characters like Rias from Highschool DxD would probably be intrigued by Naruto's strong will and his ability to never give up, which is somewhat similar to the way devils in their world pursue power.
Given Naruto's status as a yokai, his interactions with the Highschool DxD characters would be complex. He could be a source of mystery to them. With the perverted Issei, Naruto might find his behavior a bit off - putting at first but would gradually understand his character. When it comes to the more powerful characters like Sirzechs, Naruto would show respect but also not be intimidated. He could also form a sort of rivalry with some of the more combat - oriented characters, like Kiba, as they compete to see who is stronger in different types of battles, whether it's a one - on - one fight or a group battle against a common enemy.
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.
The Son of Thor would interact in diverse ways. With Annabeth, he could have some intellectual exchanges. She might be intrigued by the Norse mythology he represents and how it compares to Greek mythology. Grover would be friendly towards him, and they could share stories about their different worlds while on a journey. As for Percy's other friends, the Son of Thor would bring his own sense of honor and strength, which could earn him respect or cause some friction depending on the situation.
Naruto would probably be very friendly and curious. He'd be excited to meet all the different types of beings in the Highschool DxD world. He might start by trying to make friends with Issei, sharing his stories about his own battles and adventures in his world.
The OC, as the Son of Sparda, could fit in by being a new and powerful entity. He might be initially seen as an outsider, but his powers would quickly draw attention. He could become involved in the power struggles between the different factions in Highschool DxD. For example, the devils might try to recruit him, while the angels might be wary of his presence. His unique abilities would also make him a valuable ally or a fearsome opponent. And in the high school setting, he could be a bit of an enigma to the other students, both human and supernatural.
Some of Ben's more heroic aliens, like Upchuck, could have really funny interactions. Upchuck might accidentally eat some of the devil fruits or other magical items in the DxD world, causing all sorts of wacky effects. And the angels in DxD might be initially suspicious of Ben, thinking he's some kind of new unknown entity. But as they see him fight against common enemies, they could start to respect him. Ben, on the other hand, would find the whole concept of the different supernatural races in DxD fascinating and might want to learn more about their powers.