Lily is the younger sister of the protagonist, Jonas. We know that they share a warm bond and that Lily loves children. She hopes to be a Birthmother initially, but her parents tell her that this is not an honorable profession. They steer her toward becoming a Nurturer, which she appreciates. Jonas comments on Lily’s casual attitude toward detail, including her braids, which are forever unkempt.
Through this, we learn that Lily is a typical young child and one in need of parental reminders regarding societal expectations. Lily’s favorite comfort object is her elephant, which her father cautions that she will soon have to relinquish to the Newchildren due to her age. A bit later in the plot, Jonas tries to give Lily the memory of actual, living elephants. Lily is unable to understand what he is trying to do and thinks the idea is silly.
Lily accepts the society around her without question and does not possess the insights of her brother, to his dismay. She is a static character in this novel and does not undergo any significant character change.