In a more complex scenario, Naruto could be influenced by an outside force. Let's say an enemy of Konoha uses mind - control or some form of manipulation on Naruto. They make him believe that the ANBU is the enemy of the village and that he needs to take them down. As he betrays the ANBU, he slowly starts to realize that he's been used, but by then he's already in too deep and has to find a way to fix the situation and regain the trust of his friends and the village.
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 idea could be that in the fanfiction, Hinata is under the influence of a powerful genjutsu. This genjutsu makes her see Naruto as a threat to the Hidden Leaf village. So, she betrays him to protect the village in her distorted view. It could lead to a lot of inner conflict for Hinata once she realizes the truth and Naruto having to deal with the pain of her betrayal.
One idea could be that their own village betrays them. Maybe there's a power - hungry leader who sees Naruto and his sister as threats to their new regime. They could be framed for a crime they didn't commit and then forced to flee the village. In the process, they might have to rely on some unlikely allies they meet on their journey, like a group of outcasts who also have a grudge against the village.
Naruto's development could involve him becoming a more calculating shinobi. In ANBU, he has to think several steps ahead. His fighting style might change from his usual straightforward attacks to more strategic and stealthy ones. He would also have to suppress his emotions more, which could lead to some internal turmoil as he struggles to keep his true self hidden.
A story could revolve around an Anbu agent who loses his mask during a mission. As he tries to retrieve it, he has to face his own identity without the mask's anonymity. It could explore how the mask is not just a tool for concealment but also a part of his psychological armor.
One idea could be that the girlfriend, perhaps under the influence of an enemy, reveals Naruto's bloodline secrets to those who would use it against him. For example, she might be tricked into thinking she's helping Naruto in some way, but actually endangering him.
In 'naruto betrayed fanfiction', sometimes Naruto is betrayed by the hidden village itself. They might not support him when he needs it most, perhaps during a major battle against a powerful foe. The village could cut off his resources or even try to capture him. Also, a betrayal could come from a character who Naruto trusted to train him, but instead uses his training to turn Naruto into a weapon for their own evil purposes.
One idea could be exploring the character's past in the ANBU in more detail. For example, showing the difficult missions they had to undertake and how it shaped them.
One idea could be exploring Itachi's time in ANBU and how Naruto might have influenced his decisions secretly. Maybe Naruto, with his unique way of seeing people, could have made Itachi question his path in the ANBU more deeply.
Another plot could involve the Anbu team being tasked with protecting a young and powerful ninja from another village who has valuable knowledge. Along the way, they form an unexpected bond with this ninja and learn new techniques from them.