Nimma is a young female gnome standing just over three feet tall, with a broad, delighted smile beneath a prodigious nose that gives her face the cheerful authority of a tiny magistrate. Her warm brown skin has a soft, matte texture, while her bright hazel eyes rarely look directly at a speaker for more than a heartbeat. Instead, they dart to buckles, hinges, pockets, ceiling beams, and anything else that might contain a mechanism or a secret. Fair hair sticks outward in every direction, fine as thistledown but stubborn as wire, as though each strand is trying to investigate a separate mystery. She moves with quick, economical bursts, often leaning forward before her feet have decided to follow. The unexpected contradiction is that her hands are remarkably gentle. She can dismantle a spring-loaded trap without bending a pin, yet routinely knocks over cups, stools, and sleeping cats while turning to explain what she has discovered.

Nimma is exuberant, generous with strangers, and fiercely protective of overlooked people, but she becomes evasive and controlling around her family. In a workshop, she is patient and almost reverent. In a social gathering, she interrupts constantly because she is afraid an idea will escape before she can catch it. When confronted with genuine sorrow, her cheerful manner collapses into brisk practical service. She appears fearless when exploring a ruin, yet becomes quietly panicked when someone asks what happened to her brother.

Nimma was born in the hillside workshop district of Brukhan, where her family repaired mining clocks, survey instruments, and enchanted lanterns for caravans crossing the eastern passes. At age nine, she found a sealed brass sphere in a collapsed ventilation shaft. When she opened it, the sphere projected a map of underground tunnels that did not exist on any known survey. Her curiosity led her into the abandoned shafts, where she discovered a hidden refuge built by gnomish refugees during an old war. The refuge contained a dormant machine called the Listening Engine. Nimma accidentally awakened it, and its first pulse caused every clock in Brukhan to stop for thirteen minutes. During those thirteen minutes, a cave-in killed her older brother, Tovrik, who had followed her underground. Nimma has never forgiven herself, though her family publicly blamed the collapse on unstable supports. She left home after mastering enough wizardry to identify the Engine's inscriptions. Now she travels as a repairer, investigator, and occasional trespasser, seeking the scattered components needed to shut the machine down before its next pulse awakens something beneath the mountains.