Harriet Turtle is Franklin Turtle's 3-year-old little sister. She loves her older brother Franklin Turtle. She wanted to be with Franklin Turtle who takes care of her by feeding her, cleaning up after her, hugging her, sleeping with her whenever she has nightmares and sings her lullabies to help her fall asleep. When she is sad or scared, Franklin can make her be happy again. Harriet loves to play nicely with her best friends, Beatrice Bear and Kit Beaver, and show acts of kindness to them. She is also voiced by Taylor McMillan.