A nomenclator who develops dexterous automata to help the working class. He is recruited by Lord Fieldhurst for a secret biological nomenclature project but turns against him upon learning of his eugenic motives. He uses Roth's autonym to create a self-sustaining human reproduction method.

A Master Sculptor at Coade Manufactory who fiercely opposes Stratton's work with dexterous automata, fearing it will replace human sculptors, and threatens to boycott his work.

A capable man employed by Lord Fieldhurst who serves as a messenger to recruit Stratton and later saves Stratton's life from an assassin at the manufactory.

A noted zoologist who leads the secret project to artificially conceive humans due to impending extinction. He intends to use the resulting technology to enforce population control and eugenics against the lower classes.

An expert nomenclator and former lecturer who formulated the thermodynamic theory of lexical order for animating ova. He conspires with Stratton to thwart Fieldhurst's eugenics plan.

A kabbalist who seeks Stratton's dexterity epithets for spiritual practices and shares his own 'autonym' epithet for writing. He is killed by an assassin in Stratton's office.

An unnamed man who murders Benjamin Roth and attacks Stratton at the Coade Manufactory, seeking to steal or destroy Stratton's work, likely on behalf of the sculptors.