>>87171850She and Mira Pink are the only surviving OG /lig/gers. Sachi if you want to count her. I remember Natsumi Moe debuting as her own English speaking channel and I was already watching Yuikai and Mira before that.
Everyone else either quit, rebranded, or was so NGMI that even when there were a handful of Twitch vtubers they still couldn't get partner. I think Mira and Yuikai have stuck around so long because they're just using vtubing as a hangout thing rather than making good money from it.