The Genial Magician
From The Fifth City Wiki
"He's a good engineer, despite that missing hand. But zailors fall silent when he passes."

The Genial Magician lost his job after losing his hand to a Fingerking, and he's sworn revenge on said serpent. Despite this handicap, he is still able to perform some genuinely magical magic tricks, albeit with certain preparations.
Before he lost his hand, he made a deal with the Fingerkings. He would deliver a box to someone at the Department for Menace Eradication, and they would tell him the secret to one of Monsieur Pleat's tricks. He betrayed them, and told the contracter who the box was from. The Fingerkings were not happy with him.