Our senpai in here reminds me of Toking Sora in hololive. She essentially started the company with the CEO by approaching him with her idol dream. And she's revered by everyone to the point where she often just wants people to treat her like just another vtuber. But she's extremely influential.
Btw, if you'd like an example of a vtuber live concert , here's an officially posted example https://youtu.be/C_AHQ2Rwx3s?si=35Ki-AoHtbpStnBQ