Princess Mindy (voiced by Scarlett Johansson) is the daughter of Neptune in the animated series SpongeBob Squarepants. She first appears in the SpongeBob Squarepants Movie, and later in a few episodes. She is good friends with both SpongeBob and Patrick. Princess Mindy is a mermaid, so the most important part of her costume will be the mermaid skirt. From there, some green body paint, a blue wig, and the right accessories will complete the look.