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.
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.
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.
Latias could initially go into hiding, feeling hurt and betrayed. She might avoid Ash at all costs. Then, Ash could realize his mistake and start searching for her to apologize.
He could introduce some new combat styles to the Dueling Club. His experience in fighting monsters as a demigod would give him an edge. He might be a bit of an enigma to the Hogwarts professors too. They would be intrigued by his different kind of magic. And with his being betrayed, he could be a bit guarded at first, but gradually open up as he realizes that not everyone at Hogwarts is like those who betrayed him. He could also discover some hidden chambers or secrets in Hogwarts that have a connection to his demigod world, like a hidden place that has a link to the Greek gods.
Well, Harry might become very bitter. He could turn to other allies like Neville or Luna for support. He might also start to question all of his relationships and become more withdrawn.
He would be heartbroken. Naruto has a big heart and has always trusted his friends. This betrayal would be a huge shock to him.
The story could explore how Naruto's power is affected by this betrayal. Maybe his godlike powers start to waver because his emotional state is so unstable. He might have to go on a journey to regain his confidence and control over his powers. Along the way, he could meet new characters who help him understand that not all relationships are doomed to end in betrayal. This would be a great way to develop Naruto's character further in the fanfiction.
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.