Actually, Stacy is a mimic octopus, and she made herself look like a villainess, such as Atlantette's former helper, Sally, the evil sea witch, who vows to take on Empress Aquaria's throne. Therefore, you don't have to worry about Stacy, as she's technically an ally, as she babysits Atlantette to make her a strong warrior. Considering the fact that mimic octopus can impersonate such movements and actions from many other animals. Pretty fascinating, right?