https://www.mycast.io/profiles/35508/username/analuizamachadofranca Does this too. They have an unhealthy obsession with Millie Bobby Brown as Owlette. She/He will mass downvote the actor your cast, you're casting suggestions, the actor's images, and your actor profile if you are on it.

Sorry for the half a year quote reply here. I think this user or another person may still be doing these votes as I have been getting notifications for my nomination from back in December 2020 for Millie Bobby Brown as the Overcasted Actress from another user's story. Though they have not downvoted anything from that story at all.
https://www.mycast.io/stories/the-mycast-awards-1/roles/overcasted-actress-on-mycast/1254056/suggestions/millie-bobby-brown/2351397