A key element is the power contrast. Superman is extremely powerful compared to many characters in High School DxD. So how his powers are portrayed and how they interact with the existing power systems in DxD is important. For example, his super strength and flight can change the way battles play out.
If Superman were in Highschool DxD fanfiction, the power dynamics would be drastically altered. Superman's super strength, speed, and heat vision would make him an overpowered character. He could easily defeat most of the foes in the Highschool DxD universe. This would likely change the plot as many of the story arcs in Highschool DxD revolve around the characters gradually growing in power and facing challenges that match their strength. It might also lead to different character interactions. For example, Superman's moral code might influence the more morally ambiguous characters in the series.
In 'naruto reborn dxd fanfiction', it may explore how Naruto's character develops in a completely new and different environment. Since the DxD world has a different power system and different kinds of relationships, Naruto would have to face new challenges. He might have to learn about the Rating Games in DxD and participate in them using his ninja strategies. Also, his values from the Naruto world like friendship and perseverance would be put to the test in this new world filled with different temptations and dangers.
Lex Luthor would be a classic choice. He could be jealous of the protagonist who is reborn as Superman and see him as a threat to his own power and influence. Luthor might try to use his intellect to create new weapons or strategies to defeat Superman.
In a 'reborn as superman fanfiction', you could explore the idea of Superman being reborn into a future where Earth has become a desolate place due to environmental disasters. He has to not only use his powers to protect the remaining humans but also find a way to restore the planet. This would add an interesting ecological aspect to the story, as Superman tries to use his powers like super - speed to plant trees all over the world and his freeze breath to create ice caps again.
Another great fanfiction could be 'When Superman Joins High School DxD'. Here, Superman decides to enroll in the school in the DxD world. His actions and decisions, guided by his strong moral compass, create a lot of interesting situations. It's a story full of adventure, as he has to deal with the various challenges and temptations that the DxD world presents while staying true to himself.
One idea could be that Superman, with his powers, becomes a sort of protector in the High School DxD world. He could use his super strength to stop any over - the - top fights that break out between the different factions. And his heat vision might come in handy when dealing with some of the more dangerous magical threats that lurk in the shadows of the school.
Well, if Superman were in High School DxD fanfiction, the power dynamics would be completely shifted. Superman's super strength, flight, and heat vision would make him a dominant force. He might be seen as a rival to the devils and angels in the DxD universe. His moral code would also likely influence the more hedonistic characters in the series.
In the school in Highschool DxD fanfiction, Superman could be a protector. He would use his powers to keep the students safe from any threats, whether they are from the supernatural world or just normal human dangers like a fire or a bully. He might also be a role model for the students, showing them what it means to have a strong moral compass.
Well, aside from Naruto and Issei, there could be other important characters. Rias Gremory, who is a devil princess in DxD, might play a significant role. She could be curious about Naruto and his powers, or she might even see him as a potential ally or threat. Also, characters like Akeno Himejima, Kiba Yuuto, and others from the DxD series could be part of the story and interact with the reborn Naruto in different ways.