Walldow is a shadow-shaped human businessman. He is of average height and has an elegant suit. He is an employee of the company "Shadowster's Clarez" which is shown in the identification that he has hanging around his neck. The company is in charge of collecting data about the human world and how it works. His goal is to make the shadow world work with excellent quality just like the human world. He secretly goes to the human world and helps needy children.