Cleo was born in Dolphin City to her parents and few years later became an big sister to Kim. She became friends with Emma, Rikki and Lewis in grade school. Cleo has long, straight, deep purple hair, violet eyes, and fair skin. In both forms, she has multi-colored beads braided into pieces of her hair.

As a human, her more commonly worn outfit consists of a white tee, blue overalls, and flip-flop style sandals.