Susie is a kid fish who makes many cameos and background appearances throughout the series.
Susie is a dark tan-colored fish child with light blue lips and black eyes. She is seen in episodes wearing a pink or a magenta skirt.
She has been shown with many different adult fish. Nat Peterson has appeared as her father, but it is unknown who her mother really is. Her mother is most likely Nat's ex-wife, Shubie, as revealed in "Not Normal."