Nero is a lean, sharp-featured tiefling with swept-back black hair, dark crimson skin, and polished obsidian horns that curve close to his temples. His most immediately noticeable feature is his grin, which reveals slightly elongated canine teeth and a habit of showing too many of them when he laughs. He dresses in a well-cut burgundy coat over supple leather armor, with a dozen subtle pockets, hidden seams, and interchangeable accents that help him become someone else at a moment's notice. In any room, his eyes rarely settle on faces. They move constantly to doors, windows, hands, belts, purses, and the objects people unconsciously guard.

Nero is warm, observant, and theatrically self-assured. He treats conversation like a card game, always watching for the moment someone reveals what they want. Beneath the practiced charm is a genuine sympathy for outsiders, debtors, runaways, and anyone forced to survive by pretending to be someone else.

Nero grew up in the back rooms of a traveling confidence troupe that moved from market town to market town, selling miracle tonics, prophetic readings, and impossible promises. His infernal appearance made him useful as both spectacle and misdirection, while his quick hands and quicker mind made him indispensable behind the scenes. He learned early that people did not truly pay for truth. They paid for the version of truth that let them sleep comfortably. Nero became an expert at giving them exactly that, complete with forged seals, invented family names, and a reassuring smile that showed just enough tooth to make him memorable.