His overprotectiveness can also make his relationships with other heroes in the Justice League a bit rocky. They might see him as being too controlling and not trusting enough. For example, Superman might try to convince Batman to ease up on his overprotective ways towards his own 'territory' in Gotham, which could lead to arguments.
Well, it can strain his relationship with Robin. Robin might feel stifled by Batman's overprotectiveness and start to rebel. This can create a lot of tension between them, like in some fanfics where Robin tries to prove himself by going against Batman's orders.
His overprotectiveness towards his sibling might make his friends a bit cautious. They might not want to involve Naruto's sibling in any dangerous missions or activities for fear of angering Naruto. For example, Kakashi might be more hesitant to let Naruto's sibling go on a mission with the team.
For the new generation of ninja like Boruto and his friends, they might view Sakura's overprotectiveness as strange. Boruto in particular, who has his own views on Naruto, might not understand why Sakura is so over the top in protecting Naruto. This could lead to some misunderstandings between the generations.
When it comes to his relationship with the Justice League, if Batman has new powers like energy projection, it could change the power dynamic. Some members might be jealous or feel threatened by his new abilities, while others would see it as an asset to the team. For instance, Superman might be a bit cautious at first as Batman's new powers could potentially rival his own.
Well, it could make other characters a bit wary of approaching his sister. For example, if Naruto is overly protective, some characters might think twice before getting too close to his sister in case they anger Naruto. It could also lead to some misunderstandings. Maybe some characters misinterpret Naruto's protectiveness as his sister being weak or in need of constant supervision, when in fact she might be quite capable on her own.
Well, if Batman has new super powers in fanfiction, it can make some characters more in awe of him. For example, Robin might look up to him even more. On the other hand, some villains might be more afraid or more determined to defeat him.
In certain fanfictions, the izuku system is a secret. This secrecy can strain his relationships as he has to constantly lie or be evasive about his sudden improvements. But when the truth comes out, it can either lead to a huge rift or a deeper understanding among his friends, depending on how the writer chooses to portray it.
His relationship with his sensei, like Kakashi, could become more complex. Kakashi would feel guilty for not being able to protect Naruto from the experiments. And Naruto might start to question Kakashi's ability to keep him safe. This could lead to a strain in their relationship at first, but later they could grow closer as Kakashi helps Naruto recover from the trauma of the experiments.
With the teachers, like Dumbledore, he might be treated differently. Dumbledore might see this transformation as an opportunity for Harry to learn new things about the wizarding world from a different perspective. And some of the more traditional teachers might have different expectations of Harry's behavior in class now that he is a girl.
If Naruto has a physical disability like a broken arm that doesn't heal properly in fanfiction, his friends like Sasuke and Sakura would need to step in and help him more. Sasuke might be more protective, which could change their dynamic from a competitive one to a more collaborative one. Sakura could use her medical skills to try and find a way to heal him, which would bring them closer. His relationship with his teachers, like Kakashi, would also change as they'd have to adjust their training methods.
His relationship with Naruto would become more complicated. Naruto might be torn between believing in Sasuke's innocence and following the village's decision. Sakura would be deeply affected too. She might be in disbelief and try to find a way to get Sasuke reinstated.