Cattleya Yvette la Baume le Blanc de la Fontaine is the elder, and seemingly favorite, sister of Louise.
Cattleya is Louise's older sister. She is physically weak from chronic illness. She has a gentle heart and Louise yearns for her. She also has a large bust, something that Saito immediately noted. She appears in the second season and is often seen with a variety of small animals. Helps Saito and Louise escape from the Vallière estate.