Sneeshqin is a wiry, undersized tabaxi with dusky gray-brown fur, a narrow muzzle, oversized ears, and a long, constantly twitching tail. He presents himself as Skaven, a rat-folk identity rooted in the Under-Kingdom beneath Skav, and has trained his tabaxi features into an unsettlingly rodent-like expression through posture, grooming, and habit. He wears patched scale mail beneath a stained leather work apron, with belts crowded by vials, wire, gears, chalk, and stolen fasteners. Within a minute of meeting him, most people notice that he takes up far more space than his slight frame should, leaning over belongings, peering into faces, and reaching toward anything mechanical. He constantly checks a brass screw-cap at his throat, a tiny container holding powdered reagents and lock oil.

Sneesh is quick-witted, suspicious, theatrical, and relentlessly opportunistic. He compliments people while examining how best to exploit them, invents insulting nicknames for anyone who disappoints him, and treats every conversation as a negotiation whose terms have not yet been revealed. Beneath the selfishness is a buried fascination with genuine loyalty, though he would deny this even while risking himself to preserve it.

Sneeshqin Floattail, usually called Sneesh, was born beneath the cursed city-state of Skav, where thousands or millions of rats were transformed into sapient beings by an unknown act of sorcery, necromancy, or lichcraft. The awakened creatures slaughtered the inhabitants above and built a civilization below, an immense labyrinth of sewers, foundations, workshops, warrens, and abandoned vaults known as the Under-Kingdom. Sneesh grew up among Skaven who treated every bargain as a trap and every friendship as a temporary alliance. As an urchin, he survived by stealing tools, carrying messages through dangerous tunnels, and selling the same secret to several rivals before any of them realized what he had done. His talent for repairing broken mechanisms eventually made him useful to a workshop faction that specialized in traps, crude firearms, alchemical charges, and scavenged magical devices. Sneesh learned to coax unreliable machines into working, often by replacing missing parts with teeth, wire, or pieces of other machines. When a succession dispute threatened to make him the convenient victim of a powerful patron, Sneesh sabotaged the faction's defenses, forged an escape route through the upper ruins, and fled Skav with a pack of tools and a handful of stolen components. He now travels as an artificer, treating companions as assets and danger as an accounting problem. He has no intention of returning to the Under-Kingdom, though the unfamiliar experience of being valued by people who are not immediately trying to use him has begun, very slowly, to disturb his certainty that everyone is disposable.