Roger is about the size and shape of a duck, though he has a fan-shaped tail that he can open and close. He is literate, and serves as King Ato's reader, reading from newspapers or the 800 volumes in the royal library. He knows enough to skip the dull parts.
Though his personality can be caustic at times, Roger is smart and perceptive, and functions as an effective lookout and crew member in Ato's avocation as cook on the Crescent Moon, the ship of Captain Samuel Salt. (Pirates in Oz; Captain Salt in Oz)