Incidental 42 (named Dave,Frank,Percy,Isabelle,Harold, and Scooter) is a Bikini Bottomite and one of the most common background characters in the series. He is an orange fish who usually wears a light blue shirt. He first appears in the episode "F.U.N."
He is a red-orange fish with light tan fins and flippers. He wears a light blue top and has light olive-green lips.
His name is Frank in "Dying for Pie." SpongeBob had shown Squidward and introduced him to everyone in Bikini Bottom. The last person seen to be introduced was Frank. This name was revealed when Squidward addressed him.