Ghost Uniqua is a ghost with the abilities to float, walk through objects, and make herself disappear. She has unsuccessfully attempted to scare Tasha by disappearing and lifting up a book to make it look like the book was floating in mid-air.
Ghost Uniqua is glowing blue and transparent.
Uniqua has played Ghost Uniqua in one episode of The Backyardigans: "It's Great to Be a Ghost!" from season one.