Ichigo could be a sort of mediator. Given his transcendent nature, he might have a different perspective on the conflicts between the devils, angels, and fallen angels in High School DxD. He could use his powers to try and bring about peace or at least a truce among them. For example, if there's a battle about to break out, he could step in and use his unique abilities to stop it. His very presence could change the way the characters interact with each other.
He could fit in as a mysterious new student. His transcendent powers would set him apart from the rest. He might initially be seen as a threat by some of the factions in the school.
Well, it could be about Ichigo having some super - transcendent powers that he has to hide in the High School DxD world. Maybe he's a new student there and his powers start to disrupt the normal balance of the supernatural elements in the school.
Naruto has a very outgoing and friendly personality. In the High School DxD world, he would probably try to make friends with everyone, regardless of their race or faction. This could lead to some very interesting interactions. For example, he might try to convince the devils to use their powers for more positive things, like protecting the innocent, rather than just for their own gain. And his skills in stealth and combat would make him a valuable asset in the battles that often take place in the High School DxD world.
Well, Naruto's friendly and outgoing nature would make him quickly form friendships in High School DxD. He could also use his ninja skills to outwit the devils and other supernatural beings in various challenges and competitions within the school. His ability to never give up would inspire the characters in this new world.
Naruto could also be a catalyst for change in the High School DxD world. His values of friendship and never giving up could inspire the characters there. He might introduce new ways of training or fighting. His ability to endure pain and keep going would be something that the characters in High School DxD, who are often more focused on power and status, could learn from. He could also bring a different perspective on the relationships between different species in that world, given his own experiences with different ninja clans and villages.
The characters in DxD would be quite shocked at first. Ichigo's appearance and his powers are so different from what they are used to. For example, Rias Gremory would probably be intrigued by Ichigo. She might try to form an alliance with him, seeing his potential as a powerful ally. Issei, being the main character in DxD, would likely be both jealous and in awe of Ichigo's abilities, and might challenge him at first but then learn from him over time.
He might fit in by becoming a teacher or some sort of mentor at the school. Since he has such great power, he could teach the students new ways of using their own powers or just general combat skills. In the process, he'd get involved in all the drama and power struggles within the school, adding a new dynamic to the story. He could also have his own goals and motives that are slowly revealed as the fanfiction progresses.
He fits by being an overpowered character that disrupts the normal power balance. This can make for interesting stories as the RWBY characters have to adapt.
Naruto could fit in as a powerful outsider. His physical abilities and combat skills would be highly regarded. For example, his speed and strength from his ninja training could rival some of the stronger devils in High School DxD. He would also bring his own sense of justice, which might be different from the devils' motives. This could lead to some interesting conflicts and resolutions.
He could fit in as a new and mysterious student. With his godlike powers, he would quickly become a figure of interest. Maybe he'd be scouted by different factions in the DxD world, like the devils or the fallen angels, who see his potential as an ally or a threat.
He could be seen as a mysterious figure at first. Given his different appearance and abilities compared to the devils, angels, and fallen angels in the DxD world. Naruto might initially be a target of suspicion, but as he shows his good heart and helps out in various situations, like protecting the school from an attack, he would gradually be accepted. He could also have some interesting interactions with the magic and power systems in the DxD universe, maybe even finding a way to combine his chakra with their powers.