earlier anon mentioned a shoujo magazine vtuber survey
i think i found it:
https://ciao.shogakukan.co.jp/topics/147810/it was not, as anon described it, a ranking of kid-friendly vtubers, but a ranking of the most popular vtubers among their high school aged readers
>1) Usada Pekora>2) Amakami Konomi>3) Houshou Marine