Sasuke would likely be a bit more reserved in his reaction. He might see the cybernetics as a potential advantage for Naruto but also as a sign of Naruto relying too much on technology rather than his own natural skills. However, if he saw that the cybernetics made Naruto stronger and more capable of fighting their common enemies, he would probably come to accept it over time.
Well, if Naruto had cybernetics in fanfiction, his physical strength could be enhanced. For example, his punches and kicks might carry more force, allowing him to take on stronger opponents more easily. His speed could also be increased, making it harder for enemies to track him. Maybe the cybernetics could also enhance his chakra control in some way, like allowing him to more precisely direct his chakra for jutsu, which would make his Rasengan even more powerful.
If Naruto has leukemia in a fanfiction, his friends' reactions would be complex. For example, Kiba might be angry at the situation, feeling that it's unfair to Naruto. He would try to find ways to make Naruto feel better, like taking him on walks with Akamaru. Rock Lee would be inspired by Naruto's fight against the disease, seeing it as another form of training. Tenten would help by getting any items or herbs that might be useful for Naruto's treatment. And all of them together would form a strong support network for Naruto, constantly reminding him that he's not alone in this fight.
Sakura might be initially shocked and worried. She'd be concerned about how this new entity within Naruto could affect his health and stability. But she'd also be curious to see if this could give them an edge in future battles.
His friends like Shikamaru would likely find the whole situation tiresome at first. He'd be thinking 'What a drag, now we have to deal with Naruto and his pacifier.' But then he might start to see the humor in it and use it as a way to tease Naruto in a friendly way. Choji would probably be more sympathetic and offer Naruto some snacks to go with his pacifier, seeing it as something that makes Naruto a bit more vulnerable and in need of comfort.
Sakura would probably be the first to jump into action. As a medical ninja, she'd immediately start examining Naruto and try to figure out the cause of the fever. She might be worried but also very focused on treating him.
Sakura would likely be very concerned. She's a medical ninja, so she'd first check Naruto's physical condition to make sure there's no underlying medical issue causing the panic attack. Then, she'd try to calm him down by speaking softly and reassuringly, reminding him of all the times he's overcome difficulties.
His friends would probably be shocked at first. Sasuke might be a bit conflicted, seeing Naruto with an Uchiha - like power. But they would also realize it could be a great advantage for Naruto and for their team as a whole.
Sakura might be initially suspicious. She is a smart girl and would wonder about the butler's intentions. She might keep a close eye on him to make sure he doesn't harm Naruto in any way.
It might actually strengthen his relationships in some ways. His friends could see him as an even more powerful ally. Naruto, with these new powers, could protect them better. Sakura, for instance, would feel safer around him and this could lead to a deeper bond of trust between them.
His relationship with Kakashi could also shift. Kakashi, being experienced, would be both intrigued and worried about Naruto having the Millenium Puzzle. He would try to guide Naruto in understanding and using it properly. Naruto would respect Kakashi's wisdom more in this scenario and would look to him for advice on how to handle the power and the responsibilities that come with the Millenium Puzzle.