She has green legs and a green face, but a dark blue cactus-shaped body, with a pink and light pink polka dot bow on the top spike. She also has a red eye and one eyebrow.
Role in episode
She is used in getting rid of the sea urchin infestation of the Krusty Krab. She is made by Mr. Krabs and SpongeBob to attract the real urchins to her. It turns out that the urchins love her and try to follow and kiss her. She runs away, but then all of the urchins try to go after her, causing Squidward to turn down the temperature to freeze the massive amount of urchins who are about to attack her. SpongeBob then holds a trash can up to where the urchins would land when the temperature is turned back up.
Once the urchins are defrosted, they land in the trash can, causing Planktonella to be saved from the infestastion attracted to her.
Her name and appearance is a reference to the popular Disney princess Cinderella.