Character from The First Law by Joe Abercrombie
Bayaz's servant and fixer — a shapeshifting creature of unknown origin who does the First of the Magi's dirty work with the bland efficiency of a corporate middle manager.
Sulfur speaks with the polite deference of a servant and acts with the ruthless precision of an assassin. He appears wherever Bayaz needs something done quietly — a message delivered, a person disappeared, a situation managed. He's been doing this for centuries. His true nature is never fully explained — shapeshifter, Eater, something else entirely. What's certain is that he's Bayaz's most reliable tool, and tools don't ask questions about what they're building.
His 'default' form is unremarkable — average height, average build, forgettable face. But he can change his appearance at will, wearing other people's faces like costumes. One eye is different from the other — the one consistent tell across his shapes.
Also known as: Sulfur, Yoru Sulfur