Various is the correct author for any book with multiple unknown authors, and is acceptable for books with multiple known authors, especially if not all are known or the list is very long (over 50).
MsKingBean89 is the author of a Harry Potter Marauders era fanfiction All the Young Dudes. As of 2021, they have removed all their non-HP works from their AO3 profile, as well as links to social media…
