A user (or maybe a group of users) from Brazil has been spamming "Wesley Silva Ramos" roles on several stories and in addition, spamming random actors and fictional characters as those said roles.
Here are the usernames I could find:
https://www.mycast.io/profiles/95642/username/elianeconceicao
https://www.mycast.io/profiles/100322/username/joaosanttos
https://www.mycast.io/profiles/101085/username/elianesilva1
https://www.mycast.io/profiles/101135/username/fabiogalo
https://www.mycast.io/profiles/101843/username/evelinevelin
Here are some of the roles they have added:
https://www.mycast.io/stories/one-piece-live-action-tv-series-east-blue/roles/wesley-silva-ramos/5829477
https://www.mycast.io/stories/team-fortress-adult-swim/roles/wesley-silva-ramos/5292461
https://www.mycast.io/stories/batman-villians/roles/jogo-man/4814748
https://www.mycast.io/stories/batman-villians/roles/willy-wonka/5003773
In addition, they've been spamming "Wesley Silva Ramos" as a suggestion on some stories:
https://www.mycast.io/talent/wesley-silva-ramos