Marinette might be initially shocked when Adrien steps in to protect her. She could be very grateful and show it with a shy smile or a simple 'Thank you.'
However, there could be a group in Kiri who are more open - minded. They might be curious about Naruto and his abilities. They could welcome him and even offer to train with him, sharing their unique water - based jutsu knowledge in exchange for his knowledge of Konoha's techniques.
A fanfiction might also explore a love story between Kiri and Spider. Since they are from different backgrounds, with Kiri being a Na'vi and Spider being human - raised among the Na'vi, there would be a lot of cultural and biological differences to navigate. However, their shared experiences growing up on Pandora could be the foundation for a strong emotional connection. They might have to fight against the norms of their respective societies to be together.
Another reaction could be that Marinette pretends to cooperate with Adrien at first. By doing this, she can buy time and look for an opportunity to escape or get help. She might act as if she is okay with what is happening while secretly planning her next move, like leaving a clue for someone to find her or finding a way to disable Adrien temporarily.
In a more complex fanfiction, Kiri and Spider could be on a mission to save Pandora from a new threat. As they work closely together, they start to notice things about each other that they hadn't before. Kiri might admire Spider's courage and adaptability, while Spider could be in awe of Kiri's spiritual powers. This mutual admiration could grow into a romantic relationship over time. They would have to deal with the fact that their relationship might not be accepted by everyone, especially those who are more traditional in the Na'vi society. But their love for each other and their determination to protect Pandora could give them the strength to face any opposition.
The exploration of their friendship or potential romance is also important. Writers might focus on how they communicate, whether it's through Kiri's spiritual connection or Spider's more practical knowledge. Their relationship can develop as they learn from each other, like when Kiri teaches Spider about Eywa's signs and Spider shows Kiri human technology. And it often plays a big role in the fanfiction.
Marinette can react by standing up for herself. She might confront Chloe directly and tell her that her actions are wrong. This shows Marinette's strong character.
Marinette could react with disbelief and assume it's some sort of joke at first. But when she realizes Adrien is serious, she might start to get really nervous. She could start fidgeting with her hands or her hair. If she's in the middle of doing something, like working on a design, she might drop her tools in surprise. Once the shock wears off, she would most likely be very happy and accept his invitation, but it would be a very flustered and excited acceptance.