Pandæmonium, born Maya Libelle, is the eldest daughter of Countess Libelle and sister to Manon Libelle. Summoned as a Lost One from another realm, she transformed into one of the Four Major Human Errors when her Pure Concept of Chaos twisted her identity and erased her memories, leaving her consumed by the singular purpose of propagating disorder. Imprisoned for a millennium within a fog-shrouded dead zone in the Southern archipelago, her confinement weakened after Akari’s tampering with time fractured her prison. This enabled her to seep into Libelle by exploiting Manon’s sacrificial body. Her powers let her spawn monstrous forms through shapeshifting, regenerate by manipulating blood currents, and persist eternally in an ageless vessel. She resurrects the dead by puppeteering repurposed corpses—like reconstructing Manon from Mitsuki Matou’s remains. Once a vibrant soul who reveled in song and dance, her corrupted psyche now merges childish whimsy with a obsession for horror cinema, which she reenacts through anarchic schemes. Her cheerful facade masks the void where her former self resided. Manon initially failed to recognize their kinship, recalling only their mother’s tales of an elder sister, forging a fraught dynamic between them. In conflicts, Pandæmonium deploys battlefield ingenuity, swarming enemies with conjured horrors and altering her physiology to counter threats. Her encounters with Akari betray a sharp interest in the girl’s time-warping gifts, suggesting awareness of the temporal cycles Akari’s resets perpetuate. Even partially sealed, her chaos gnaws at the world’s safeguards against the Four Human Errors, sustaining her legacy as a catalyst for collapse.