If the past life speculations actually pan out then well her voice isn't exactly her strong suit. After reviewing the archives, it seems that this speculation is based upon them using the same uncommon text emojis and having a book theme.
https://twitter.com/shiorinovella/status/1684240639725121546 https://twitter.com/shiorinovella/status/1684231027395383299 https://twitter.com/Vtuber_Moe/status/1025403711844220928https://twitter.com/Vtuber_Moe/status/1144042529622544384These emojis might be a regional thing I've never seen before, but they sure aren't commonly used in the English vtube scene. She's not particularly remarkable at anything but I could see her averaging 5k along the line.