Eileen is the leader of the Church of Gears, a cult which aims to give purpose to Cityfolk by converting their bodies into gears, contributing to a grand purpose. Her assassination from the Full-Stop Office is intercepted by Argalia, who then recruits her to join the The Reverberation Ensemble, taking the role as the harp

Eileen is extremely manipulative and charismatic to other people, especially of those in desperation. She insists on gears being the most effective way of operating things, and how civilizations should act too. Her philosophy is about the inefficiency and pains of being lost in life with a lack of purpose and how if people can become gears, they can find purpose and fulfill their roles they were predestined for in life, although her means of accomplishing this is unethical.

Eileen has a soft, medium voice, and takes on a priestly tone.