Indigenous creatures living on the deserted island where Guest crashed or wandered into. "Salmonid" is a general term for the species; many types and forms exist on the island. They usually have a vacant, spaced-out personality, wandering in small communities, but they are surprisingly aggressive toward intruders like Guest. They are special fish that have adapted to land through mutation or evolution, allowing them to live both underwater and on land, though they prefer natural watersides. They move by flapping their tail fins to crawl along the ground.

Other wild animals besides Salmonids. Guest may encounter or discover them during the plot. Most are ordinary birds, insects, reptiles, or aquatic life. However, rare creatures exist, such as jellyfish that swim through the air, chickens with horns like water buffalo, or strange plants that walk and eat like animals. Even wyverns and dinosaurs may rarely appear.