Incidental 30A is an anchovy background character. His model sheet is a redraw of the brown anchovy design from "Help Wanted" and makes several cameos throughout the series, starting with the episode "Valentine's Day."
Incidental 30A is a basic brown anchovy who wears a blue shirt. Unlike the "Help Wanted" anchovies, Incidental 30A is solid brown, rather than darker brown with a light brown front. He also has more oval-shaped pupils and a blue shirt instead of a white one.