Mercy!

This character is the nicer person compared to Judith her sister. Mercy is more calm and doesn't give attitude and does what she is told with no questions. When her cousin Kit shows up with no notice, she welcomes her with open arms. She is also very nice and friendly to others, and she is very layed back. From what the book says, it seems she is the one who could care less about the rules her dad has set for her.