Mrs. Poecilia is a background character who first appears in the episode "Whale of a Birthday." She later appears in "What Ever Happened to SpongeBob?" and the book Good Ideas... and Other Disasters.
She is a lime green fish with a light orange dorsal fin and has black eyes. She wears a blue dress and a white apron, black shoes, and pink lipstick. She has a large head and many rounded teeth.
As shown in Good Ideas... and Other Disasters, she is married to Mr. Poecilia and has 26 young children.
Role in series
In "Whale of a Birthday," Mrs. Poecilia visits the Bikini Bottom Mall and walks by the sunglasses store. SpongeBob hides in her mouth so that he can buy Pearl a pair of purple sunglasses without her seeing him.
In Good Ideas... and Other Disasters, she and her husband hire Mr. Krabs to babysit their 26 children. Mr. Krabs tells them a story from his old sailing days, but when he mentions Davy Jones and his ghost pirate ship, the kids get scared. The kids are still hollering and screaming when Mr. and Mrs. Poecilia return. Mrs. Poecilia gets mad at Mr. Krabs and sends him away with no pay.