Just to supplement the info on Tonya. IIRC, about a year ago, the LITMEDIA CEO got sued for something, and tried to sell off the VTuber IPs to pay for the lawsuit. The other IPs got sold to 3Y (where they are still around as
LUVDIA) but Tonya negotiated hard to keep her IP. Eventually, the company went under (what the lawsuit was, I don't think anyone ever really knew).
Tonya was their first VTuber and LITMEDIA's only VTuber for a while until they debuted a KR-only branch. She was supposed to be their EN flagship talent at the start but LITMEDIA tried to coax her into dropping EN and making solely KR content, at least until they got proper KR talents. Don't recall the exact circumstances, but around this time she
got groomed made friends with Nini Yuuna, got accepted into a university in the US, and they've been living together ever since.