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.
Naruto could also choose to forgive those who betrayed him in an unexpected way. In the Naruto series, he was always one to believe in the good in people. So in the Highschool DxD setting, he might try to understand the reasons behind the betrayal. He could use this as an opportunity to teach the characters in the Highschool DxD world about the importance of trust and friendship, and in doing so, change the dynamics of the relationships there.
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.
A really interesting fanfiction could be where Naruto's Nine - Tails chakra has an unexpected reaction when he is near Moka. Maybe it flares up in a way that he can't control at first, and Moka's vampire instincts sense the power. This could lead to a situation where they have to work together to figure out how to control this new interaction between their powers. Also, Naruto could introduce the concept of ninja teams to the characters in Highschool DxD, which could change the way they approach battles and group activities.
Well, in such a fanfiction, Naruto might feel out of place in the Highschool DxD world. He could be heartbroken because he misses his friends from Konoha. Maybe he has a hard time adjusting to the different rules and powers in the new world.
Well, if Naruto is betrayed by Koneko in fanfiction, it could lead to a dark turn in Naruto's character. He might become more distrustful and cynical. Maybe he would start to question all his previous relationships and alliances. He could also go on a journey to find out the reason behind the betrayal and in the process, discover some dark secrets about the world he lives in.
One possibility is that Naruto becomes more isolated. After being betrayed by Akeno, he might find it hard to trust others. He could go off on his own to train harder and become stronger, vowing to never let such a betrayal happen again. This could lead to him unlocking new powers or abilities as he focuses solely on self - improvement.
If Naruto were betrayed in RWBY fanfiction, his values would be put to the test. Naruto believes in friendship and hard work. Being betrayed would make him question those beliefs. He might start to become more cynical, which would be a big change from his usual positive self. On the other hand, he could also use this as an opportunity to grow. He could learn about the different values in the RWBY world and try to find a new path. And perhaps, in the end, he would be able to forgive the person who betrayed him, but not without a long and difficult journey.
Well, it could be really interesting. The characters in Highschool DxD might get some new and crazy ideas. For example, Issei might be inspired by the ninja skills in Naruto fanfiction and try to incorporate them into his own fighting style. He could start thinking about using stealth and quick strikes like a ninja in his battles against other devils or fallen angels.
One possibility is that Naruto's skills would be put to extreme use in ANBU's more secretive and dangerous missions. His unique abilities like the Shadow Clone Jutsu could be utilized in stealth and assassination operations, but he might also face a moral dilemma as ANBU often deals with morally grey areas.
One possibility is that Naruto could turn to the dark side. After being betrayed by his friends, his faith in the bonds he once cherished is shattered. He might start using his godlike powers for revenge, targeting those who wronged him. This could lead to a series of battles and a whole new dynamic in the Naruto universe.
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.