Lily Kazahana, also known by her transformation identities Flower Knight Purity and later Princess Neige, is a central character in Princession Orchestra. She is a fifth-grade elementary school student who is the younger sister of Sumire Kazahana. Lily is a quiet and reserved girl who does not openly display her emotions, and she often speaks in a tone that seems older than her age. Despite her reserved demeanor, she finds joy in singing and dancing freely at Alicepia, where her treasured people are. Her image color is pink white.

At the beginning of the story, Lily serves as the Flower Knight Purity, a role in which she is tasked with gathering Musessence for the White Queen in order to prevent the destruction of the fantasy world. When the White Queen appears, she loses her powers as the Flower Knight. However, after meeting a character named Toma, she obtains the power of a princess and awakens as Princess Neige. This transformation is a turning point that allows her to overcome her sadness, grasp hope, and break away from the influence of the White Queen. As Princess Neige, she contributes to the battle using song and dance as sources of energy, a common ability among the princesses of the series. Her closest relationship is with her older sister Sumire, who serves as her partner, and her development centers on moving from a quiet, dutiful figure to a more self-determined one. Her notable abilities include her princess transformation and the musical power she wields in combat.