They know Kiara because she's easy to know. She goes out of her way to talk to them. Thus, they get excited for her at the start, but then she becomes a known quantity.
Mori technically knows some Japanese, but she's aloof and distant due to her social awkwardness, plus the aesthetic she likes is very different to what they are used to. People put on a pedestal what's hard to chase. If Mori was more approachable, then she would be less exciting to them