Of course, the likes of Hello Kitty, My Melody, and Cinnamoroll are the most popular ... you'll need to find the Mermaid Outfit. Here's how to find all three pieces of the set.

To celebrate another year around the sun, the “Stranger Things” star transformed into a mermaid, rocking long blond fishtail braids and an ocean-green sequined dress, complete with a starfish.