The Akatsuki members, if any are still around, would have diverse reactions. Some might see it as a weakness in Pein, while others might be curious about how this new family dynamic could change the balance of power in the shinobi world. Hinata would be shyly supportive of Sakura. She would understand the importance of love and family, and she would hope that Sakura finds happiness, even if she's a bit intimidated by Pein's past actions.
Sakura would be worried sick. She'd try to figure out what happened to Naruto to make him act this way. She might try to talk to him, use her medical ninjutsu to check if he's under some kind of genjutsu or has some other problem. She'd be very vocal about her concerns and would try to get the other villagers to help bring Naruto back to his normal self.
Sasuke would be extremely suspicious. He has always seen Naruto as his rival and a symbol of the village's hope. If Naruto starts acting like Pein, Sasuke would think it's some kind of trick at first. He might even be ready to fight Naruto to figure out what's really going on.
The Akatsuki members, if they were to encounter Naruto in this state, would have different reactions. Some might see it as an opportunity to target him when he's vulnerable. However, others like Pain, who has his own beliefs about the cycle of pain and suffering, might be a bit more conflicted. He might see Naruto's unborn child as a symbol of a new beginning or just another target. And the other Konoha ninjas, especially the younger ones, would look up to Naruto even more. His pregnancy and time travel situation would make him seem even more of an enigma and a source of inspiration as he's facing such unique challenges.
Sakura might be completely shocked at first. She might freeze for a moment, not believing what's happening. Then she could start crying tears of joy and say yes immediately.
Sakura might be initially shocked and a bit jealous, but she would probably come around to support Naruto as a friend. Kakashi would be more of a calm and collected figure, offering advice on how to handle the situation both as a ninja and as an expecting father. Sasuke, on the other hand, might be indifferent at first but later show some concern for Naruto's well - being in this new situation.
If Sakura and Pein were siblings, it could potentially change the power dynamics in the Naruto universe. For example, Sakura might be able to influence Pein's actions to some extent. She could try to persuade him to avoid attacking Konoha or at least reduce the destruction. This could also change the way the other characters in Konoha view her, as she would be related to one of their most dangerous enemies.
Ino would be very involved. Since she's Sakura's friend, she would be constantly checking on Sakura, giving her advice on pregnancy - related things like what to eat and what not to do. And she would also be helping with preparing things for the baby, like baby clothes and a nursery.
Draco's family could be divided in their reactions. Some of the more conservative members might disapprove, thinking Luna is not a suitable match. However, if there are any family members who have seen Draco's growth and change, they might be more understanding. Luna's father, for example, would likely be very supportive and might offer some of his unique wisdom or magical items to help with the pregnancy.
Sasuke would likely be filled with rage. He and Naruto had a complex relationship, and Naruto's death at Sakura's hands would make Sasuke seek revenge or at least demand answers. Kakashi, on the other hand, would be deeply saddened. He was Naruto's teacher and would probably feel a sense of failure.
Sasuke would probably be a bit surprised at first. He has his own complex relationship with both Naruto and Sakura. But he would likely respect their relationship in the end. Kakashi would be supportive, he has seen Naruto and Sakura grow up and would be happy for them. The other villagers would also be happy as Naruto is a hero to them, and seeing him happy with Sakura would be a positive thing.