Edna
Edna is a quiet yellow elderly fish that makes only few cameo appearances in most episodes.
She debuts a cameo appearance in Mermaid Man and Barnacle Boy.
In The Sponge Who Could Fly, The SpongeBob SquarePants Movie & Gramma's Secret Recipe she appears beige.
In Krabs vs Plankton and The Krusty Sponge she makes a cameo appearance attending courthouse.
In The Two Faces of Squidward she makes a brief cameo appearance along with other fish.