Sophie is Mr. Mason's servant. She loves Mr. Mason, but she loves Mr. Tinkles more. She has three sisters. Sophie gives Mr. Tinkles baths and dress him up in outfits, which her sisters do as well whenever he visits.
At one point, Sophie was scared of Mr. Tinkles because he talked in his sinister role. After that, she was banished in deep, cold Antarctica.
In the end after she is rescued from banishment, Sophie took Mr. Tinkles to live with her and her sisters so he could "be good".