Rikkatori (Left) Before you interact with him. (Right) After interacting with him.

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

Looks familiar.

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.