Incidental 21, also known as Incidental PM13, is a fish who makes occasional appearances throughout the series, beginning with the episode "Ripped Pants." He is classified as a "hotdog" type incidental.
He is a peach-colored fish with big orange eyes and has reddish-brown fins and lips. He wears a teal shirt.
Role in series
He sings "The Very First Christmas" along with a bunch of citizens.
He appears several times as one of the many customers participating in the Krusty Krab bulletin board.
He can be seen at the beginning sipping a soda at the Krusty Krab.
He is seen in the crowd at the end of the episode.