>>1208922Learn Malay instead of Bahasa Indonesia.
But I'm sure there is more internet resource on how to learn Bahasa Indonesia compare to Bahasa Melayu.
Learn Bahasa just for Hololive ID, not worth it. Other than Reine, their Bahasa much more influenced heavily by city slangs/accent. Simply put, it's not that very formal Indonesian.
Reine by far closest to Formal Bahasa Indonesian especially her accent and soft-spoken.
I rate them :
Reine > Risu > Anya / Iofi >> Ollie (No Indonesian that Turbo) >>> Mona
t. Seanigger but not indog