Princess Usagi Small Lady Serenity is the future daughter of Usagi Tsukino and Mamoru Chiba in Bishoujo Senshi Sailor Moon. She is better known as Chibiusa, the princess of the Moon Kingdom in the 30th century and a key ally of the Sailor Guardians. Her character serves as an important bridge between the present and future, often driving major story arcs with her emotional growth, mysterious origins, and close bond with Sailor Moon.