Carmella operates for the Akashic Record Reform Committee, an organization privy to significant future events. She has medium-length blondish-brown hair with purple hues and typically wears attire resembling a female student uniform.

Her duties involve identifying candidates for transformation into self-aware zombies. She directly orchestrated the illegal zombie conversions of Shiba and Yoshizumi, bypassing established protocols. Carmella wields dimensional manipulation capabilities, enabling her to create spatial distortions and control space; this ability functions similarly to Michiru Kita's powers.

She maintains contact with Doctor Yoshizumi, indicating ongoing collaboration or surveillance. Removing her core causes her physical regression into a diminutive, deformed state, confirming she is the same entity type as Zarame.

During a confrontation in Volume 8, Carmella threatens Michiru's companions. This provokes Michiru to destroy Carmella by crushing her core, leading to her permanent elimination. Following her death, narrative focus shifts to Chitose's quest for vengeance against Michiru, driven by Carmella's absence. Beyond Chitose's reaction, other characters show little reaction to her death, consistent with her portrayal as an isolated figure within the Committee.