Roy is a bird that was also created by Master. From time to time he will act broken and Winter has to use a key on his spring to fix him. In case he doesn't do that in time, Roy will lose his memories. This already happened once when his Master forgot to set him and Roy is very afraid now of history repeating itself. Roy fells that he is incomplete because he doesn't have a human body. He had the task to teach all Master's creations to walk, talk etc. Roy actually lied to Master that Winter and Zoe are defects because he was afraid he will not be getting Master's attention anymore.