Zipper is a brave, friendly, tough, spunky, and loyal fly. He is shown to be very close best friends with Monterey Jack most of the time.
Zipper spent much of his life traveling the world with Monterey Jack. He joined the Rescue Rangers after Monterey's home was destroyed by Fat Cat in an event that gave Monty a grudge against him that is strangely not brought up again anywhere else in the series.
Zipper is the only member of the Rangers not to speak much other than to make squeaky chirps. He is the smallest of the Rangers and laughs like Woody Woodpecker.
Despite the smallest of the group, Zipper serves as big help for the group. He can be quick to anger, often forcing the others to keep him out of trouble. He hates seeing his friends in trouble. Zipper is often seen traveling with Monterey Jack and sharing his opinions, facts, ideas, and ironically, his pain. Whenever Monterey suffers cheese attacks, Zipper proves to be tougher on him while talking him down. His special talent is mostly flight and lock-picking.