Ester is the Starfish Princess and the best friend of Polvina and Tubarina, though she sometimes seems to get along better with the former. She usually visits the Octopus and Shark Palaces from time to time, especially after school and on weekends. Ester's personality changes according to the situation. When she makes plans, she assesses the ideas and plans of others and adapts them or does it her own way with less-than-honest actions. Ester is a very curious girl who loves to read and watch documentaries on cable television. She dreams to one day know about Dryland and also the stars in the sky. She also has a pet starfish named Spikey.