Well, a possible plot twist is that Naruto's time in ANBU makes him realize that the cheating was just a misunderstanding. Maybe he was being manipulated by an enemy who made it seem like he was cheated on. Also, there could be a plot twist where Naruto finds out that he has some sort of special power or connection while in ANBU that is related to the cheating incident. For example, the person who cheated on him was trying to unlock this power in Naruto without his knowledge. And finally, it could be that Naruto's new ANBU comrades are secretly working for an organization that wants to use Naruto's new - found anger and pain from the cheating for their own evil purposes.
A plot twist could be that the one who cheated on Naruto is actually an undercover agent for a good cause. And Naruto, while in ANBU, has to work with this person again on a crucial mission. Another plot twist might be that Naruto's joining ANBU was all part of a plan by an unknown force to keep him away from the truth about the cheating. In ANBU, he uncovers clues that lead him to question everything he thought he knew about the situation. Also, there could be a situation where Naruto's ANBU experiences change his view on the cheating so much that he decides to forgive the person without even fully understanding the real reasons behind it at first.
One plot twist could be that the person who cheated on Naruto actually has a very good reason, like they were forced to do it to protect Naruto from a greater threat. Another could be that in ANBU, Naruto discovers that the cheating incident was part of a larger conspiracy against him. Maybe his new ANBU teammates turn out to be related to the cheater in some way, creating a lot of internal conflict for Naruto.
Well, in such a fanfiction, Naruto's character might become more cynical at first. Being cheated on is a huge blow, and it could shatter his trust in relationships. When he joins ANBU, he may focus all his energy on his new duties. He could become more reserved and less of the exuberant Naruto we know. His skills would likely improve rapidly in ANBU, as he pours his heartache into his training. And over time, he might find a new sense of purpose and family within the ANBU ranks, gradually rebuilding his sense of self - worth.
Well, in such a fanfiction, perhaps Naruto has just lost Sasuke again and is deeply depressed. The ANBU, seeing his skills and his need for a distraction, recruit him. He starts off being a bit of a misfit in ANBU, not following all the rules because of his independent nature. But as he continues, he starts to understand the importance of their work. He might even form new bonds with his ANBU comrades, which slowly help him come out of his depression.
In such a fanfiction, the plot could involve Naruto being constantly overlooked by the village. Fed up with this, he decides to join ANBU to prove his worth. He might face challenges like distrust from his ANBU comrades at first because of his reputation. But as he goes on missions, he shows his skills and determination, gradually earning their respect and changing their perception of him.
Well, in a fanfiction where Naruto joins ANBU, his training would intensify. He'd be trained by some of the toughest ANBU veterans. His skills in combat would become more refined as he'd learn to use weapons like kunai and shuriken with more precision. He may also develop new jutsu that are more suitable for covert operations. His growth as a ninja would be different from the regular path, focusing more on secrecy and assassination if required.
One possible plot could be Naruto facing the internal politics of ANBU. He might struggle to adapt to their more secretive and sometimes morally gray operations compared to his usual straightforward ninja way. For example, he could be assigned to a mission where he has to spy on a former ally, creating an internal conflict within him.
Maybe the ANBU who raise Naruto are actually part of a secret group within the ANBU that has its own agenda. They could be training Naruto to be a weapon against a hidden threat in the shinobi world. As a result, Naruto's journey would be about uncovering this conspiracy while also dealing with the fact that his upbringing has made him an outcast among the regular shinobi. For example, he might be too brutal in his fighting style for the more traditional ninja.
In this kind of fanfiction, one possible plot development could be Naruto having to deal with the secrecy aspect of ANBU. He might struggle with the morally grey missions they undertake. For example, he could be sent to spy on an old acquaintance. Naruto, being Naruto, might try to find a more positive solution to the situation rather than blindly following orders.
Well, one possibility could be that Naruto discovers that his friends have been secretly working against him in some way, like lying about their intentions or using him for their own gains. Maybe they've been making deals behind his back that go against what he believes in.
One common plot twist could be that Hinata finds out she was actually set up. Maybe someone was jealous of her relationship and made it look like her partner cheated. This would add a layer of mystery and give Hinata a chance to fight for her relationship.
Well, Naruto might face a whole new set of challenges. In the ANBU, he could be pushed to his limits physically and mentally. Maybe he'd use his unique skills in stealthier ways compared to his normal fighting style. Also, his relationships with other ANBU members would be interesting to explore, as he's a bit of an outlier with his loud and brash personality.