Raziel, the Crimson Biblioprincess, guards the Bibliotheca Razielis Archangeli—a vault of Phantom Books accessed via a keyhole hidden beneath her left eye, shielded by a metallic eyepatch. Charged with reconstructing the shattered Sefer Rasiel, a celestial tome containing all divine and mortal secrets, she orchestrates the creation of Phantom Books by manipulating human ambitions and tragedies. Once an angel entrusted with chronicling heaven’s wisdom, she was cast into the sea by jealous peers, her original form bound to the scattered fragments of the Sefer Rasiel. Only by reclaiming these shards, sealed as Phantom Books within her library, can she regain her full power.

Her alliance with the Professor, her key-keeper, hinges on mutual ambition. His golden key, fused into his right hand, unlocks her repository, enabling their schemes to harvest Phantom Books from human despair. They resurrected Ilas, a World War I pilot driven to madness, and gifted Mabel Nash the cursed Rahōto Reihō Kaigen, manipulating events in Nudelwald to forge a nuclear weapon for post-war Germany—a nod to the Professor’s nationalist fervor. Their plans often unravel due to interference, such as Hugh thwarting Ilas’s descent into chaos.

Mocking, impatient, and sadistic, Raziel revels in human folly, her laughter echoing at others’ misfortunes. She trades barbs with Dalian, the Black Biblioprincess, their rivalry laced with cryptic allusions to a shared history. Though prone to cruel taunts, she occasionally slips into childlike gestures—sticking out her tongue, hiding behind the Professor when threatened—hinting at fractured vulnerability beneath her malice.

Visually, she manifests as a pale-skinned girl with short green hair, clad in a crimson dress accented by gold armor. Her exposed left eye reveals a void portal to her library. Design nuances shift across adaptations: the manga grants her dark-feathered wings and a plunging neckline, while the anime softens her palette, highlighting purple-striped thigh-high socks.

Spin-offs like *Dalian-chan's Bookshelf* reimagine her as a clumsier, less sinister figure—a friendly rival who bickers comically with Dalian while secretly cherishing their bond. Though stripped of her original cruelty, her trademark arrogance persists.

Her philosophy starkly opposes Dalian’s: where Dalian seals Phantom Books to protect humanity, Raziel champions unfettered access to forbidden knowledge, accusing her counterpart of divine hypocrisy. This clash fuels their conflicts, framing broader debates over power, morality, and the perils of enlightenment.

Through arcs like *The Mystic Archives of Rasiel* and *Libricide*, her schemes intersect with pivotal historical moments—World War I’s battlefields, Cold War subterfuge—weaving her into humanity’s struggles for dominance, survival, and the price of secrets too dangerous to wield.