Incidental 90 is a light brown elderly fish who makes background appearances in several episodes. He resides at Shady Shoals Rest Home.
He is a dark tan fish with a light tan dorsal fin, with dark red spots on his head. He wears light red and light blue boxers. He has an underbite.
He first appears in the episode "Mermaid Man and Barnacle Boy." He can mostly be seen in Shady Shoals Rest Home in a few episodes. In "Mid-Life Crustacean," he is since on the line with other elderly to the ice cream stand.
- "What's his problem?" - "Mid-Life Crustacean"