Sakura would likely bring a small gift when meeting Sasuke's family, which would be a nice gesture. His family would welcome her and start a conversation. Sasuke's mother could be very warm and ask Sakura about her own family. Sasuke might stand by Sakura's side, holding her hand or giving her reassuring looks. And Sakura would try to engage with Sasuke's younger relatives, like playing games with them to break the ice.
When Sakura meets Sasuke's family, there would be a lot of unspoken emotions. Sasuke's father might have a stern look at first, but as he sees how Sakura stands up for herself and her beliefs, he starts to respect her. Sakura would be in awe of Sasuke's family's history and heritage. She would ask a lot of questions, and the family would be happy to answer. Sasuke would be the mediator in some cases, translating some of the more complex family traditions or stories for Sakura, and through these interactions, a deeper connection between Sakura and Sasuke's family would start to form.
Sasuke and Sakura's kids would likely have interesting interactions with other characters. For instance, they could interact with the elders of Konoha. The elders might be cautious about their power, given their parents' reputations, but also see them as an asset to the village. When it comes to the new generation of foreign ninjas, their kids could be ambassadors of sorts. They could use their family names to open doors for better relationships between different ninja countries. Also, with the local villagers in Konoha, they would be seen as local heroes' children, and some might look up to them while others might be a bit intimidated by their lineage.
Sasuke would probably be on his best behavior. He'd be polite and quiet at first, observing everything.
Sasuke might become more empathetic. After the war, he has seen the destruction and pain it caused. With Sakura by his side, he could learn to express his emotions better. Sakura, too, could become more confident. She has proven herself during the war, and now she can continue to grow, especially in her relationship with Sasuke.
Suppose Sasuke has the power to corrupt things with his demonic touch. Sakura, on the other hand, has the power to restore and revive. In a fight, Sasuke could use his power to weaken an enemy, and then Sakura could use her restoration power to turn the enemy to their side. Or, in a more romantic sense, Sasuke's touch that usually corrupts could be purified by Sakura's presence, showing the deep connection between their powers and their relationship.
Sakura might develop into a more confident and assertive person. After the war, she has proven herself as a strong kunoichi, and with Sasuke by her side, she could grow even more. Sasuke, on the other hand, would develop by learning to trust and love again. He has been through so much, but with Sakura's love and support, he could become a more stable and caring person.
Shisui would likely be very calm and observant. He might interact with Sakura in a somewhat reserved way at first. For example, he could just give her a polite nod when they first meet on the train. Sakura, being more outgoing, would probably try to start a conversation. She might ask him about his travels or his skills. Shisui would then answer in a measured tone, sharing only what he thinks is appropriate.
In a fanfiction, Madara might initially be dismissive of Sakura. But as she shows her strength and intelligence, especially when it comes to the significance of the lemon (maybe it has some sort of magical or medicinal property), he starts to respect her. Sakura, on the other hand, would be cautious around Madara due to his reputation, but she also sees the potential in him to help with whatever task involves the lemon. The lemon could be a catalyst for their interactions, like they have to protect it together or figure out its secrets.
Sakura, being the energetic and kind - hearted character she is, would likely try to share her lemonade with Itachi. Itachi, who has a solemn and serious demeanor, might be hesitant at first but then accept it out of politeness. This simple act could start a conversation between them. Sakura could start asking Itachi about his life and his past, and Itachi, after some hesitation, might start to share some of his story with her, leading to a deeper connection between the two characters.
Sasuke's character might develop by becoming more open and affectionate in the family setting. He starts to let go of his past grudges and focuses more on building a future for his family. Sakura, on the other hand, becomes even more strong - willed and nurturing, using her medical skills to keep her family healthy.
In fanfiction, Sakura may be shown as teaching her medical ninjutsu to her children, which further develops her as a teacher - like figure. Sasuke could be developed through his interactions with his family. For instance, he starts to understand the value of family more deeply and this changes his cold - exterior, making him more relatable.