Sakura would likely be a bit intimidated by BB at first. BB, on the other hand, would probably be very confident and start bossing Sakura around a bit.
The plot could involve Sakura using her magical abilities to summon BB. BB might then cause some chaos in the Fate universe. Maybe she'll play tricks on the other servants or try to gain more power.
Marrow might be a bit cautious around Kimimaro at first, given Kimimaro's rather intense and somewhat dark nature. Sakura, on the other hand, would likely be more open - minded. She might try to start conversations and break the ice. Kimimaro would probably be quiet and reserved, observing Marrow and Sakura. He may not be very talkative but his actions would speak volumes. Marrow could gradually warm up to both of them as they face challenges together.
Sakura would likely be in awe of Itachi and Shisui's skills at first. Itachi, being the more reserved one, might be a bit distant but would gradually warm up to Sakura as he sees her determination. Shisui, on the other hand, would be more friendly and approachable. He might be the one to initiate conversations and break the ice between the three. They could have exchanges about their different ninja backgrounds.
The interaction between them could be really interesting. Ilya, coming from her own magical background, would show Naruto some of her unique spells and abilities. Naruto, impressed by her magic, would then try to combine it with his ninja techniques. For example, he could use Ilya's teleportation spell in a new way during a fight. And they would also have some emotional exchanges, like when Naruto shares his story of losing Sasuke and Ilya comforts him with her own understanding of loss in her world.
Archer and Arturia would likely start off with a bit of friction. Archer, being from a different time and having his own set of beliefs, might clash with Arturia's more traditional knightly values. However, as they face challenges together, they would gradually learn to respect each other. Irisviel would be the mediator, guiding their interactions and making sure they stay focused on the task at hand.
Naruto, being his curious and friendly self, would probably be excited to meet the Final Fantasy summons. He might try to befriend them immediately. For example, if he summoned a Cactuar, he would likely be amused by its appearance and try to communicate with it. Sasuke, on the other hand, would be more cautious and see the summons as tools for power. He would study them to figure out how to use them to his advantage in his quest for revenge.
Naruto would probably be in awe at first. He'd try to communicate with Mothra in his usual friendly and exuberant way. He might start by introducing himself and his village, just like he did with other summons. Then he'd try to understand Mothra's powers and how they can be used to help in battles or protect the village.
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.