Kezka is a medium-height human woman with warm brown skin, swept-back black hair, and a pair of short, backward-curving crimson horns. Her eyes are dark amber, with a faint ember-like glimmer when she invokes magic. She dresses in a weathered scholar's robe beneath fitted leather armor, keeping her sleeves ink-stained and her boots practical. A thin brass chain around her neck holds a scorched iron key, the only thing recovered from her family's home. She smells faintly of lamp oil, old paper, and cinnamon. Before speaking, she usually takes a careful breath through her nose, as if testing whether the air is safe.

Kezka is observant, dryly humorous, and intensely protective of vulnerable people. She approaches conversation like research, asking precise questions and remembering details others overlook. She dislikes grand speeches but has a stubborn talent for saying exactly the one sentence that makes a guilty person uncomfortable. Despite her pact, she remains compassionate, and she is quick to offer practical help without asking whether anyone deserves it.

Kezka was born to a human family of provincial archivists who preserved banned histories, disputed genealogies, and the records powerful people preferred forgotten. Her family's work made them useful to scholars and dangerous to tyrants. When a local magistrate ordered their archive burned, Kezka returned from a supply run to find the house ablaze and her parents trapped inside. The official explanation called it an accident. Kezka knew better, but knowledge alone could not bring them back or punish the people responsible. She spent years searching monastery libraries and private collections for evidence, learning enough occult lore to recognize that the magistrate had not acted alone. The trail led to a contract written in Infernal, signed by a devil who had been quietly trading favors for generations. Desperate to expose the conspiracy and protect the few survivors connected to her family, Kezka accepted the devil's bargain. In exchange for power, she agreed to recover certain names, relics, and secrets whenever her patron demands them. She tells herself that a deal made to fight injustice is not evil. Every night, the contract's letters rearrange themselves, reminding her that the devil is patient, literal, and already collecting interest.