Bianca is a five-year-old swimmer who attends an all-girls boarding swimming kindy with two other five-year-old girls named Beatrice and Brianna. Bianca has brown hair and blue eyes, and she is always dressed in a bright blue long-sleeved full-body wetsuit, a pair of cerulean swimming goggles, a pair of light blue rubber gloves, a blue swimming cap with bubbles on it, a pair of blue nose-clips and a pair of navy blue fin shoes. She's very friendly and joyful and loves to play with her friends.

Beatrice has blonde hair and green eyes, and she is always dressed in a green long-sleeved full-body wetsuit, a pair of lime green swimming goggles, a pair of chartreuse rubber gloves, a forest green swimming cap with fish patterns on it, a pair of green nose-clips and a pair of light green fin shoes. She is very shy and usually keeps to herself.

Brianna has red hair and brown eyes, and she is always dressed in a pink long-sleeved full-body wetsuit, a pair of lavender swimming goggles, a pair of fuchsia rubber gloves, a magenta swimming cap with heart patterns on it, a pair of pink nose-clips and a pair of light pink fin shoes. She is very bubbly, cheery and excitable.

The girls have an instructor named Mrs. Splash. She is 24 years old, has black hair and gray eyes, and she always wears a black long-sleeved full-body wetsuit, a pair of red swimming goggles, a pair of black rubber gloves, a yellow swimming cap, a pair of black nose-clips and a pair of black fin shoes. She is like a motherly figure to her three students and is very caring.