Sakura might blush a bit and scold him for being so carefree. She's always been a bit more proper, so Naruto's shirt - off moment could catch her off - guard.
Kakashi might make a light - hearted joke about it. He's the kind of teacher who likes to keep things fun and engaging. He could say something like 'Naruto, are you trying to intimidate your opponents with your bare chest?' which would make everyone laugh.
Annabeth could be one of the main characters interacting with him. She might tease him about taking his shirt off, or she could be concerned if he's taking it off because of an injury. Their relationship is complex, and this situation could add a new layer to it.
The more cautious characters could be worried about the security risks. They might think that this exposure could put Robin and the whole team in danger. However, the more emotional characters could be very touched by this gesture of openness. For instance, if Artemis has a close relationship with Robin, she might see this as a sign of his true friendship towards her. And characters like Superboy, who is also trying to find his own identity, might see Robin's act as something brave and inspiring.
It could be a story where Percy takes his shirt off during a training session. Maybe he's getting ready for a really intense sparring match and removing his shirt is part of his pre - fight ritual to show his determination and focus.
It might be that Naruto has found a new power or ability that makes the prosthetic unnecessary. For example, he could have developed a new form of chakra control that allows him to function without it. Also, perhaps he is about to engage in a fight where the prosthetic would be a hindrance rather than a help, like if he needs to be more agile and the prosthetic is weighing him down.
One possible scenario could be that Naruto is about to engage in a tough training session. He takes his shirt off to feel more unrestricted and ready to push his limits. It shows his determination and eagerness to become stronger.
Percy might be really shy and hesitant at first. He could blush and stutter, not expecting such a request from Annabeth.
In this kind of fanfic, other characters would react in diverse ways. All Might's colleagues among the pro - heroes might be supportive. They might offer their own expertise to help Izuku grow. But there could also be some who are jealous of All Might's decision and try to undermine Izuku. Among Izuku's peers, some might be inspired by his new situation. They might work harder to catch up to him. Others might feel left out. And in the public eye, there would be a lot of admiration for All Might's act of adoption. People would have high hopes for Izuku and would be watching his every move. This added pressure could also be a factor in how Izuku develops in the fanfic.
One possible scenario could be that Percy got injured and Annabeth needs to tend to his wounds on his torso, so she takes his shirt off. For example, he might have been scratched by a monster during a battle, and she has to clean and bandage the wound quickly.
Hinata would be heartbroken. She loves Naruto deeply. Her world would shatter. She might try to find out the truth behind his death, not believing that his friends could do such a thing without a good reason. And she would probably hold a grudge against those involved.
His friends might be concerned at first. They could think he's in some kind of trouble or that he's given up. But once they understand his reasons, it could strengthen their bond as they support his decision.