Rikkatori (lit. "snow bird") is a shy beaked animal that can be found in the Snow World.
He is surrounded by three arches of snow, and when interacted with, he curls up into a ball. Interacting with him further will make him shiver.
On the sprite sheet that has the bunny and Luna on it, a person wearing a mask resembling Rikkatori can be found. This person may be Rikkatori's master, and Rikkatori is their pet who has gotten lost. The person can be found wandering the White Plains.