Demon is a lean, long-limbed male tabaxi with charcoal-gray fur, silver bands around his tail, and bright amber eyes. He keeps his coat meticulously groomed, especially the fur around his face and ears, giving him an almost vain appearance despite his criminal trade. Within a minute of meeting him, most people notice his teeth. His upper canines are unusually prominent, and when he smiles or eats, he reveals a wide, predatory grin that makes even friendly expressions seem like warnings. He dresses in fitted dark leather, soft boots, and a sleeveless hooded coat lined with hidden pockets. His claws are carefully trimmed for climbing, but his fingertips remain nimble enough for delicate locks and lifted purses.

Demon is observant, quick-witted, and irreverently curious. He enjoys puzzles, dangerous bargains, and people who underestimate him. He rarely lies when a technically true statement will cause more confusion, and he prefers to solve problems with preparation, misdirection, and a well-timed escape rather than direct confrontation. Beneath his cynical independence, he is fascinated by loyalty and quietly studies anyone who offers it.

Demon grew up in the crowded backstreets of a river city, where every alley had its own rules and every locked door represented an opportunity. His first teacher was not a guildmaster or a kindly mentor, but a retired burglar who recognized that Demon could hear the difference between a spring-loaded lock and a warded one. Under that tutelage, he learned to move quietly, read people quickly, and leave a room looking untouched. He also learned that information was more valuable than coin, and that the best thieves were the ones nobody remembered clearly afterward. His career ended with a job that was supposed to be simple. Demon was hired to steal a ledger from a merchant's private office, but the book contained names of officials, smugglers, and a criminal syndicate's hidden accounts. Rather than sell it, he copied several pages and used the information to ruin the syndicate's local operation. Now both the syndicate and the authorities want the original ledger, which Demon keeps hidden somewhere only he can reach. He travels under the name Demon because it makes people expect cruelty, and expectations are among the easiest locks to pick.