Kettig appears as a tall, narrow humanoid formed from dense charcoal darkness, with faint violet light where facial features should be. A heavy gray cloak hangs from the figure's shoulders, its hem constantly dissolving into wisps that crawl across the ground. The cloak is carefully brushed and repaired at the collar, while the left pocket is visibly polished smooth from years of being rubbed and checked. Kettig wears a bronze contract token on a cord around the neck, and the metal is worn nearly flat from constant handling. Their movements are precise, economical, and slightly delayed, as if their shadow decides where they will stand a heartbeat before they do.

Kettig is dryly polite, observant, and relentlessly practical. They ask what a task is worth before asking whether it is dangerous. Beneath the mercenary exterior is a being fascinated by small acts of trust, especially gifts given without negotiation. Kettig rarely laughs, but they collect jokes from every company they work with and repeat them later in an unsettlingly accurate imitation of the speaker.

Kettig formed beneath the floorboards of a burned counting house, where the shadows of ledgers, locked chests, and dead merchants had pooled together after a failed raid. The mercenaries who found the living darkness did not destroy it. Instead, they taught Kettig the language of contracts, the habits of sentries, and the practical truth that most loyalties last only until someone offers more coin. Kettig learned to wear a cloak because people trusted a covered shape more readily than a naked silhouette, and because the garment gave their body a fixed outline in bright places. For several years, Kettig served as a scout, saboteur, and retrieval specialist for competing companies. Their shadow could stretch beneath doors, clutch a dropped key, and fold two nearby dim spaces into a brief passage. A disastrous contract changed everything. Kettig was paid to open a portal for a retreating unit, but the employer withheld the final payment and abandoned the soldiers on the other side. Kettig completed the escape anyway, then took the employer's sealed ledger instead of the promised gold. The ledger contains names, debts, and evidence that powerful commanders have been purchasing wars under false banners. Kettig now sells their services to anyone with sufficient coin, while quietly charging extra whenever a contract might expose the people who betrayed them.