Old Man Walker is a character in the animated television series SpongeBob SquarePants. He first appears in the episode "Mermaid Man and Barnacle Boy." Description: A small, light-green, elderly fish with light-orange spots on his head. He usually wears a blue shirt and thick glasses, and often uses a bamboo walker, earning him the nickname "Old Man Walker." Personality: He is usually portrayed as a dim-witted old man, leading other characters to take advantage of him.