The old coot fish is light gray with many wrinkles. He has red spots and some short strands of hair on his head. His eyes appear to have tears in them. His bed is green with a checkered pattern on it and it is usually attached to a bamboo frame with wheels.
In "The Good Krabby Name," he is seen walking without his bed. He is revealed to wear a hospital gown that is not seen in any other episodes. His gown is light blue when he is outside and it changes to light green when he is inside the Krusty Krab.
Role in series
"Mermaid Man and Barnacle Boy"
When Barnacle Boy calls Mermaid Man an "ol' coot," the old coot fish thinks that he is being talked to. He asks "Yes?" and raises his fin.
In the credits and the original script, he is specifically credited as "Old Coot."
After Plankton hypnotizes Mermaid Man and Barnacle Boy, most of the Shady Shoals residents angrily storm out of the rest home. The old coot fish is seen rolling his bed outside.
"The Good Krabby Name"
The old coot fish is one of the boat drivers on the highway. He is seen walking angrily toward the Krusty Krab after SpongeBob and Patrick's advertising technique causes a massive boat crash. When he gets inside the Krusty Krab, he yells as part of an angry mob.