Susie  Rechid -Peterson  is a kid fish that makes several cameos or 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.
Her father is Nat Peterson, but it is unknown who her mother really is. Her mother is most likely Nat's ex-wife, Shubie, as revealed in "Not Normal." Nat's current wife, Abigail is probably her step-mother. Her mother could also be Sadie Rechid, who appears with her in "Breath of Fresh Squidward." If Shubie is her mother, then she is Baby Billy's older sister.