Barbie Dreamtopia Mermaid Doll Anything is possible with Barbie! The Barbie Dreamtopia mermaid doll features a beautiful tail with colorful decorations and fantastic accents inspired by her home kingdom of Rainbow Cove. The unique mermaid look includes the exquisite mermaid tail, sea-themed accents and a removable headpiece for her colorful hair. She bends at the waist, so you can swing her tail back and forth to "swim" in the sea or sit her up to let her shimmer in the sun.