If Naruto joins ANBU after the war in fanfiction, his personality would experience a significant shift. His once boisterous and outgoing nature might be replaced by a more stoic and calculating one. He would need to be more discreet in his actions and words. The trust - building that he was so used to in his normal ninja life would be different in ANBU. He would have to be more guarded about who he trusts, which could make him seem a bit colder on the outside. But deep down, his kind heart would still be there. He'd just be more careful about showing it, as ANBU's world is full of deception and he can't afford to be too naive.
His relationship with Sasuke would be interesting. Sasuke might be initially suspicious of Naruto's decision to join such a secretive group. But Naruto could convince Sasuke that he's doing it for the greater good of the village and the ninja world, and they could end up working together on some behind - the - scenes missions.
He would likely become more withdrawn. Naruto is usually so open and exuberant, but heartbreak could make him close off. In ANBU, he might be quieter, more focused on the mission at hand. He'd still have his determination, but it would be a more solemn determination. His sense of humor might also disappear for a while as he copes with his pain.
He'd become more reserved. The ANBU environment is secretive and doesn't encourage open emotions. Naruto, who is usually so exuberant, would have to hold back. For example, he couldn't go around shouting about his dreams as freely as before.
Naruto may become more serious and stealthy. ANBU work requires a certain level of secrecy and discipline, which could tone down his usual exuberant personality.
Naruto's character development would be complex. Joining ANBU would expose him to the darker side of the ninja world. He might start to question some of the values he held before. For example, he might struggle with the idea of killing in cold blood, which was not really part of his original ideology. But at the same time, it could make him more empathetic towards those who have been forced into such actions. His relationships with his old friends would also change. He might distance himself from them to protect them from the dangerous world of ANBU, which would be a lonely and difficult process for him.
Naruto's personality would likely become more cynical. In Aogiri, he'd be surrounded by a darker crowd. His usual optimistic and friendly nature might be suppressed as he has to adapt to the group's more ruthless mindset. He might become more guarded and less likely to trust easily.
If Naruto joins ANBU after the war in fanfiction, it could lead to some interesting character developments. He would have to deal with the darker side of the ninja world that ANBU often encounters. This might make him more cynical or, on the contrary, he could try to change ANBU from within. He'd be able to use his Uzumaki powers and his Sage Mode in more covert operations, which would give Konoha a huge advantage. Also, his relationship with other ANBU members would be complex. Some might respect him immediately because of his war hero status, while others might be skeptical of his more open - minded and friendly ways.
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.
Naruto's personality would experience a significant transformation. He is used to the bright and open - minded world of Konoha. In the League of Shadows, he'd be surrounded by secrecy and a different set of values. His loyalty would be tested, and he might become more cynical. He'd have to question his own beliefs and values more often. His exuberant and friendly nature could be replaced with a more guarded and reserved one. He might start to see the world in a more complex and less black - and - white way, which would be a huge change from his original self.
He would likely become more secretive. Since ANBU operates in the shadows, Naruto would have to keep a lot of things to himself, which is a big change from his usually open - minded self. Also, the death of Asuma could make him more ruthless in combat, as he realizes the harsh reality of the ninja world. He may still hold onto his core values of protecting his friends and the village, but his methods could be more extreme in the ANBU.