Nami would probably be shocked at first. She might worry about how this would affect Luffy's journey to become Pirate King. But then she would likely start thinking about practical things like how to take care of the baby on the ship. Sanji would be over the moon, seeing it as an opportunity to cook for a new little life. He might also be a bit jealous that it's Luffy and not him having a baby with Hancock.
Sakura might be a bit hesitant at first. She's always seen Naruto as the go - lucky, friendly guy. But she would eventually support him if she saw that his intentions were good and that the empire was built on positive values like justice and equality. Sasuke, on the other hand, would be more cynical. He might suspect Naruto's motives initially, thinking it could lead to dictatorship. But after seeing Naruto's actions, he could become one of his closest advisors, using his own experiences to help Naruto avoid making mistakes. Shikamaru would be involved in the strategic planning. He would be both excited and worried about the whole idea, constantly thinking about the long - term consequences.
Sakura might be very worried. She's a medical ninja, so she would be concerned about the potential harm Naruto could be doing to himself. She'd probably try to stop him or at least monitor his experiments closely. Sasuke, on the other hand, might be more understanding in a way. He knows what it's like to push oneself for power, but he might also be a bit skeptical and warn Naruto about the risks.
Sakura would probably be a bit skeptical at first. She'd worry about how Naruto could take care of another person when he's always so busy with his ninja duties. But once she sees how much Koneko needs a home and how Naruto is committed, she'd warm up to the idea. Sasuke might not show much emotion on the surface, but secretly he'd respect Naruto's decision. Shikamaru would think it's a troublesome situation but would also see the good in Naruto giving Koneko a chance at a better life.
There could also be friends who are so loyal to Naruto that they would consider following his request if they truly believe it's for the greater good. However, they would be deeply pained by it. Kakashi, for instance, might understand Naruto's selfless nature but would also struggle with the moral and emotional implications of taking his life.
Sakura might be a bit worried at first. She's always been concerned about Naruto's safety, and a new weapon like Zabuza's sword could seem dangerous. But she would also trust Naruto's judgment in the end.
Sasuke would likely understand Naruto's motives better than most. He himself has had his own reasons for leaving in the past. He might give Naruto some advice based on his own experiences, like how to survive in unknown lands. But at the same time, he would also be a bit envious of Naruto's new adventure.
Blaise Zabini might be amused. He would probably tease Draco a bit at first, but then support him because Blaise is often portrayed as someone who is confident and not overly bound by convention. He might even give Draco some tips on how to make the hair color look even better.
Sasuke might be initially suspicious. He would question Naruto's motives and the potential danger of such an army. But after seeing how Naruto uses it for good, he might come to accept it.
Sakura might be initially shocked. She has always known Naruto as the go - lucky ninja, and the tattoos and piercings would be a big change. She might scold him at first but then come to understand his reasons behind it.