Carmen, or C, was the head researcher of The Seed of Light project, the main catalyst of the unfolding events at the Cogito Research Facility, the Lobotomy Corporation Wing, The City, and later, The Library.

She has fair skin, long dark brown hair, and red eyes. She is often depicted to have hair combed into a ponytail, pinned in place by a red bear hair pin, while wearing a lab coat, a brown suit, a skirt, and dark shoes.

Carmen is one-of-a-kind when compared to the denizens of The City. Unlike most entities in The City, who are nihilistic, corrupt and/or eccentric, Carmen stands out as a highly enthusiastic, altruistic, and ambitious person, guided solely by a desire to overturn The City's state as a corporate dystopia that feeds on carnage and human suffering. She is perceptive and charismatic, easily predisposing people to herself, gaining their trust with no effort.

She has a great research ability, as she discovered the substance that is Cogito that allowed her to start her experimentation and project to attempt to achieve "The Seed of Light". She values human lives as her goal was to bring the end of all suffering in the City but also the value of a person's will and their bravery to face adversity, and only at the severe mistake of failure, it manages to break her composure.

After Enoch's death, Carmen fell into a state of depression that took away her own beliefs and faith in what she is working for, as the cost of failure outweighed any positive outcome of knowing the result, as a human death, specially of a child used for an experimentation; was something that she couldn't turn away from. She remained in this state until her own suicide attempt.

If this Fandub continues, the chosen Voice Actor will likely also play Carmen in Library of Ruina.