Sasuke would probably be very confused at first. He has spent so much time hating Itachi for what he did to the Uchiha clan. Seeing Naruto befriend Itachi would make him question his own long - held beliefs. He might initially be angry with Naruto for seemingly siding with his enemy.
Sakura's reaction would be complex. She has deep - seated feelings for Sasuke, so it would be a hard pill to swallow. However, as a medical ninja, she would also feel a sense of responsibility towards Sasuke's pregnancy. She might offer to be Sasuke's doctor throughout the pregnancy. Naruto's friends like Rock Lee would be over the moon for him. Lee would see it as Naruto achieving another great milestone in his life. He would constantly cheer them on and might even start training extra hard in case he needs to protect the new family. As for the other Konoha ninjas, they would initially be skeptical but gradually accept the situation as they see Naruto and Sasuke's determination to build a family together.
Sakura would probably be a bit shocked at first but then be very supportive. She has always cared about both Naruto and Sasuke, so she would likely be there to help with the baby's medical needs if any. Kakashi would be the cool uncle type. He'd offer his wisdom and maybe some training tips for when the baby grows up.
Naruto would be deeply saddened. He has always hoped for Sasuke and Sakura to be happy together. He might initially try to mediate and get them to work things out, believing that their relationship can be salvaged. He would remind them of the good times and how much they mean to each other.
Kakashi is often a popular character. He has a lot of knowledge and skills, and his presence can add an interesting dynamic. He might be the one to discover Naruto and Sasuke's time - traveling secret and help them navigate the changes they're trying to make. Another one could be Sakura. She might be involved in different ways, like trying to figure out why Naruto and Sasuke are acting so differently due to their time - traveling knowledge.
Sakura might be initially shocked and a bit jealous, but as a friend, she would probably come around and support them. She has grown as a character and would understand the importance of their relationship.
Shikamaru would likely be his usual laid - back self on the outside, but secretly he'd be thinking about all the implications this has for the village and their team dynamics. He might offer some practical advice like how to manage their time and resources better now that they're going to be parents. Choji would be excited and would probably start thinking about all the delicious food he could bring for Ino during her pregnancy to make sure she and the baby are well - nourished.
Kakashi would be more reserved but still show his support. He might give Sasuke some advice on being a father based on his own experiences with his team. Shikamaru would be practical, thinking about how the baby will affect the village's future and offering some logical solutions to any potential problems that might come up.
Kakashi is a great addition. He has a long history with both Naruto and Sasuke and can act as a mentor or a source of wisdom. Sakura can also be included. Her relationship with both Naruto and Sasuke adds depth to the story. She can be a strong female character who helps or challenges them. Shikamaru is another good one. His intelligence can bring new perspectives to the plot.
Sasuke would be furious. He's always been protective of Naruto in his own way. He would immediately start looking for her, using all his skills and resources. He might even go on a rampage if he thought Naruto was in serious danger.