Mirepoc Finedel began her career as a reserve officer in The Empire's military before joining the Armed Librarians, recruited by Hamyuts Meseta. Her reserved personality made expressing internal emotions difficult, leading to bottled-up feelings that often disrupted her concentration and contributed to operational complications. This included an unspoken romantic attachment to fellow Armed Librarian Volken Macmani.

Her initial standard attire featured maroon military fatigues, always worn with white gloves. For undercover missions in places like Fulbeck City, superiors like Mattalast Ballory mandated civilian attire such as gowns. A temporary physical transformation occurred when Chacoly Cocotte transferred the Soul Transference ability to her, altering her hair color to violet; it reverted to its original blonde years later. After the Armed Librarians dissolved, she became Director of the History Protection Bureau, adopting formal office wear: a black blazer, skirt, heels, and tie, with her blonde hair in a ponytail. Her office displayed photoframes documenting historical and contemporary events.

Recognized limitations in frontline proficiency kept her combat responsibilities primarily in support roles. Her standard weaponry was a sword and pistol. Her innate magical ability was telepathy, enabling direct mental communication across vast distances, requiring knowledge of the recipient's name and appearance. This ability failed if the contacted person was unconscious or declined communication. During the global "Tearless Ending" crisis instigated by Ruruta Coozancoona, she received Chacoly Cocotte's Soul Transference ability – a vastly amplified form of telepathy permitting mental awakening across expansive regions, including areas beyond Bantorra's shores like Toatt Mine and Fulbeck City. This transfer temporarily turned her hair violet and expanded her capabilities to mass-scale consciousness restoration.

Key developments occurred during the "Tearless Ending." Awakened by Yor amidst universal stasis, she discovered Hamyuts Meseta seemingly deceased outside the library offices. Investigating Hamyuts' desk, interaction with a stored book triggered a resurgence of her long-suppressed feelings for Volken. Despite Hamyuts' condition, telepathic communication persisted between them. Utilizing the transferred Soul Transference, she orchestrated the awakening of other affected individuals globally, playing a pivotal role in countering the catastrophe. Her later tenure as Director of the History Protection Bureau marked a shift from combat operations to leadership in archival and historical preservation.