A hen who escaped from a poultry farm. As a chicken, she can neither fly nor swim. However, she possesses a brave and fierce spirit, ensuring she is never easily pushed around.

A male mallard and an exceptionally strong individual among his kind. He once held the position of Guard, a title for the mallard leader, but after being attacked by One-Eye, he can no longer fly for long periods and stepped down. He has a serious and taciturn personality. His mate is a white duck. He harbors a deep desire for revenge against One-Eye.

The marsh's real estate agent. He is a male otter. He is easygoing, talkative, and an excellent swimmer. As the local agent, he also plays the role of mediator for the complaints of other birds in the marsh. He is friends with Leafie and Wanderer.

A female domestic duck. She is a classic beautiful duck with white feathers and a yellow beak. She is Wanderer's mate and is currently brooding an egg in their nest. She is quiet and reserved, and because she lacks any aggression, she is a very physically weak individual.

A female weasel and an object of terror for almost every creature in the marsh. She only hunts live prey, making her hostile toward everyone. She lost one eye during a fight with Wanderer. She has a cruel and serious personality. She possesses teeth and claws strong enough to be called the apex predator of the marsh ecosystem.