Mindy has light-green skin, dark-blue hair, round glasses, a light-green tail, and a yellow hair bow. She wears a golden bracelet and also wears a pink midriff top with a red heart in the middle.
She is known to use "Mermaid Magic" to help others overcome their fears. There really is not any mermaid magic; it is just fake. Mindy tried to get SpongeBob and Patrick to keep going when they gave up their walk, she tried to convince them that she had "mermaid magic" (which obviously wasn't real), and used it to "turn them into men" by pulling seaweed out of the ground and putting them on their noses, successfully helping them by tricking them into thinking that they were real mustaches. Dennis revealed the trick after SpongeBob and Patrick passed through the trench.
Mindy is very beautiful and good-hearted and has a deep love for all the ocean-dwellers.
Unlike her father, she shows more compassion toward her father's subjects. She also encourages Patrick and SpongeBob to continue to Shell City, despite that she lied to them that they became men, which caused them to run into danger with overconfidence. Likewise, her personality is quite similar to Ariel from Disney's The Little Mermaid.
In the video game adaptation of the movie, Mindy reveals she actually does have mermaid magic, which she uses to get the Patty Wagon back in exchange for 50 Goofy Goober tokens.
She is the only character to have been grounded other than Mr. Krabs. Her grounding happens in the video game based on the movie.