>>26426663It's been mentioned a few times, yeah. It seems the general consensus is that there are root languages that individual languages have spawned from. So there would be, for example, an original Nijisanji language and from there different languages for the Nijicontinent would spawn. /HAHA/ might have it's own language, /rose/ has its own language, so on. This probably also goes for the Holocontinent, Indie/small-corpo lands, and Fetish lands.
A big part of the /risu/-/rose/ story was actually learning how to communicate, since they couldn't initially understand each other's languages.