Deka has a long, attentive face and a watchful way of holding still, as though listening for a door to open several rooms away. When waiting, they lean their weight onto the balls of their feet and angle one shoulder toward the nearest exit. Their hair is tightly coiled and clipped short at the sides, with a stubborn tuft that springs up again after being combed flat. Their guard's coat is well brushed but shines at the elbows from use; the cuffs are dusted with chalk and tiny flecks of dried candle wax. They smell distinctly of rosemary, lamp oil, and the mineral tang of fresh rain, a combination they think is simply what a working mage smells like. The unexpected detail is a pocket-sized wooden whistle on their belt, carved with the shape of a plump little bird. Deka uses it to call their elderly aunt's escaped chickens, not for guard duty.

Deka is practical and compassionate, but their compassion often arrives disguised as an order to sit down and drink water. They are cautious around officials yet quick to trust someone who admits uncertainty. In a crisis they become brisk and decisive; after it passes, they can be startlingly tender. With King they are teasing and stubborn, while alone they quietly worry that challenging him may push away the person they most want to protect.

Deka grew up in a wind-battered settlement whose wells were protected by a stone ward that had outlasted the people who knew how to repair it. Their first spell was an accidental mage hand, summoned while they tried to keep a roof tile from crushing a neighbor's hand. King, then a newly assigned guard, found Deka practicing in secret beside the broken well and helped them convince the local magistrate to fund formal lessons rather than punish their unsanctioned magic. During the winter the old ward failed, Deka held a breach shut with an improvised spell long enough for families to escape, but could not save the settlement's storehouse. The loss taught them that cleverness without help can still end in disaster. Deka now serves as a junior mage among King's guards and is King's closest friend. They know when King is hiding exhaustion behind duty and will confront him even when he would rather be thanked than challenged. Deka is also trying to keep their aunt's failing farm supplied with medicine, while an officious examiner at the guard college questions whether Deka's unorthodox training is safe.