Cecilia Emmergreen is an ancient automaton virtual YouTuber who debuted on June 24, 2024, as part of Hololive Justice. Originally created as an eternal slave long ago, she has recently begun pursuing her own interests and hobbies rather than fulfilling her original duties. She is characterized by her love of flowers, tea, and musical composition, and spends much of her time cooking potatoes and exploring new experiences with childlike curiosity. As an automaton powered by a mainspring, she can remain awake indefinitely without sleep. Despite her ancient origins, she approaches life with the enthusiasm of a young girl discovering the world for the first time.