Incidental 13 is a light green fish. He often makes cameo appearances. He is the husband of Vera.
He is a light green colored fish who has olive green fins and light yellow eyes. He wears dark blue shorts with a white flower design.
In "Hall Monitor," he and Vera are first seen together as a couple and they are eating a meal together. In "The Great Snail Race," he is the referee for the race and shows up when the race begins and ends. It is possible he moved Rocky to win the race, although it is unknown how Rocky won. His character is mostly quiet, but not completely silent.