In such a fanfiction, Naruto might be betrayed by his new allies in the DxD world due to misunderstandings. For example, his powerful jutsu could be misconstrued as a threat. His loyalty to his own ninja way might clash with the values of the DxD characters, leading to a rift.
In a 'Naruto betrayed DxD' fanfiction, Naruto's presence in the DxD universe could disrupt the existing power balance. Some factions might see him as a tool to be used and then discarded. He may find himself alone against powerful adversaries. His journey would be about finding out who really betrayed him and regaining the trust of those who matter, all while adapting to the unique challenges of the DxD world, such as dealing with devils, angels, and fallen angels.
Well, it could start with Naruto being tricked into doing something that goes against the DxD group's interests. Maybe he's framed for a crime he didn't commit. His reaction would likely be one of confusion and then determination to clear his name. He'd probably rely on his ninja skills, like stealth and combat, to survive in this new hostile environment.
In fanfiction, such a betrayal could occur due to power struggles. Maybe Rias sees Naruto as a threat to her position in the Highschool DxD world. She might fear his growing power and influence, which could overshadow her own. So, in order to maintain her status, she betrays him.
He could be betrayed by a false friend in the DxD world who spreads lies about him. For instance, telling others that Naruto has a hidden agenda to take over their realm.
Perhaps Naruto would try to find allies among the outcasts in the Highschool DxD world. Since he has been betrayed, he would understand the feeling of being alone and might reach out to those who are also on the fringes of society. He could form a new group that challenges the existing power structures in the Highschool DxD universe, using his unique abilities and his unwavering will from the Naruto world.
Sasuke could also be a character who is frequently betrayed in these fanfictions. Given his complex personality and his history of being both a loner and a seeker of power, he might be lured into dangerous alliances in the DxD world. And his partners in the DxD world could betray him when they realize they can't control him or when his power becomes a threat to them.
One possible fanfiction idea could be that Naruto, who somehow ends up in the world of High School DxD, is betrayed by some of the devils there. Maybe they initially seem friendly but then backstab him for his power or because they fear his potential. Naruto, being the resilient character he is, would then have to find a way to overcome this betrayal and prove himself.
In this kind of fanfiction, Naruto might face a lot of challenges. Maybe Rias, for some reason, turns against Naruto. Naruto could find himself isolated and having to fight against Rias' forces. He would probably rely on his ninja skills and his strong will to survive.
Another possibility is a misunderstanding. Maybe some false information is spread about Naruto that makes Tsunade believe he has gone bad. In the world of Naruto, there are often enemies who try to create chaos by sowing seeds of distrust. Tsunade, without fully investigating, could fall for such a trick and seem to betray Naruto.
In such a fanfiction, it could be due to a misunderstanding. Maybe Naruto was forced into a situation where he had to act against the Yugioh world for the sake of his own village. For example, if there was a threat to Konoha that was somehow related to the Yugioh realm and he was given no other choice but to 'betray' them.
One possible scenario in such a fanfic could be that Naruto is betrayed by his new comrades in the DxD world. Maybe they misunderstand his motives or are jealous of his power. For example, they might think he's using his abilities for his own gain rather than the common good.
Power struggle is also a frequent theme. Naruto is a powerful ninja, and in the High School DxD world, power is highly coveted. His powers might attract the wrong kind of attention, and those who want to gain or maintain power could betray him to eliminate a potential rival.