Lily Adler is a student at a detective school in London who becomes involved with the team Milky Holmes and their mentor, Kobayashi Opera, during their visit to the city. She is introduced when she is the victim of a theft on the streets of London and is rescued by the four members of Milky Holmes, which leads to her joining their investigation. As a student of detection, she is earnest and eager to assist, though she lacks the experience of the main group. Her role in the story is to serve as a local ally and a link to the London setting, helping the visiting detectives navigate the city and its mysteries. Lily possesses a special ability known as a Toy, which grants her the power to manipulate ice, making her a useful asset in combat and problem-solving. Her relationship with the Milky Holmes team is one of gratitude and growing camaraderie, and she works alongside them to counter the Thieves Empire. Over the course of the two specials, she shows a willingness to learn and contribute, though her development is limited by the short runtime. Her connection to Kobayashi Opera is primarily through the assistance he provides to her as a mentor figure. In terms of personality, she is polite, determined, and somewhat reliant on the more experienced detectives, but she demonstrates courage in the face of danger. Her ice-manipulating Toy is the most notable of her abilities, used both defensively and offensively during the conflicts in London.