Shirogane Rinji

From Kokorodatabase

One of the Shirogane Ryou and Shirogane Ichigo children. Shirogane Rinji (meaning "special") is the only child of theirs whose gijinka form manifested itself permanently, making it so that her cat ears and tail are always present. In her world Ichigo is in a coma, so she has grown especially close to her father. She is very intelligent and enjoys reading books.