Xanthe is a twelve-year-old girl who is a professional swimmer. She has long, golden hair and blue eyes, and she always wears a bright purple long-sleeved rash guard with flowers on it, a pair of light pink long-sleeved togs with red love-hearts on them, a pair of mint green swimming goggles, a pair of dark red rubber gloves, a pink and purple swimming cap with fish and flowers on them, a pair of yellow fins and a pair of light blue nose-plugs. Xanthe is a very calm and sweet girl who loves nothing more than holding her breath underwater. She lives with her three professional swimmer friends Indy, Sophia and Jacqueline.