Both of SpongeBob's parents are much more rounder in appearance than SpongeBob, making them better resemble real-life sea sponges.
Harold has a gray mustache and wears glasses. He is light brown with dark brown holes. He wears a white shirt, brown pants, a black and yellow belt, and a tall white hat with a brown stripe.
Margaret has black hair and is dressed in a purple matchbox dress with matching sleeveless pantalettes with purple high heels, a matching purple pillbox hat, two red bracelets on each wrist and a blue bracelet on her left wrist and wears a pearl necklace. She also wears red lipstick and has blue eyes with three eyelashes on each eye. She also has three freckles on each side of her cheeks.
- According to the book Hooray for Dads!, SpongeBob gets his love of jellyfishing from Harold.
- Oddly, the Q&A section of the official SpongeBob SquarePants website for New Zealand states that Margaret's name is "Claire Gretchen SquarePants."