>>36495311Gura and Ina are part of UMISEA, a project that exists just because Marine wished for it, so they get invited to Marine and/or Aqua related events. On top of that, many JP girls love Gura just because "same-chan kawaii~" and Ina has her own harem in JP.
I'm not sure about Ame, but she has some JP members that like her and I don't remember her ever acting disrespectful toward them so she seems like a safe pick.
Mori is invited because "kari-chan kakkoii!" and she's the most well-known music performer from EN, much to anons displeasement. Also, Suisei probably likes her.
Kiara simply doesn't have a lot of JP senpai who are interested in her in any way. She's the go-to translator, but that's about it. Besides that, I don't think her personality is liked by the nips, but that's just my opinion. She tried to stick to Peko, but Moona beat her to it. Kiara lived in Japan so she probably knows all about their social etiquette, but every time I watched her collab with HoloJP, I was always on the edge waiting for her to say or do something inappropriate, but that's probably just me.
