Blue (puppeteered by Leslie Carrara-Rudolph, and voiced by Victoria Pontecorvo) is the title character and hostess of the show. Blue is a happy-go-lucky female blue dog with plush fur who is Sprinkles' older sister. She talks and loves to sing, dance, and play with her friends. She often greets others by shouting "Hi, you!" and usually asks viewers open-ended questions. Her catchphrase is "Hoop-dee-doo!"