You is a beautiful young girl, dressed in robes. She wears her hair in round buns (or another kind of hairstyle?) and wears earrings.
She is light-hearted and very curious, as seen often pressuring Kou for details of her meetings with the king. She is also very supportive and does her best to cheer her friend up in dire situations. She has however no problems with stealing as in one of the bonus chapters Kou noticed she was eating fruit she stole. She made Kou into a collaborator by giving her one of the fruits.
You is a member of a highborn military family and at some point she was chosen to be a member of the royal harem, due to her being very beautiful. When she was five years old her only sister died due to illness.