>>5324341Taka and Zea can speak english, but they are nowhere near fluent as Hana and tend to use Indonesian a lot more on their streams. It doesn't help that being Indonesian, the topic they brought on stream usually requires you to be Indonesian in order to understand them.
Hana on the other hand, is an American who happened to live Indonesia. She's more comfortable speaking in English, and the jokes and topic she brought are easy to understand for non Indonesian. In a way, she's the "isekai protagonist" of NijiID with her 'bule' shenanigans, making her interesting for both Indonesian and foreigner.