Who is Onan from the book Dodger by Terry Pratchett?

In "Dodger" by Terry Pratchett, Onan is a character who serves as a minor antagonist. He is depicted as a member of the criminal underworld in Victorian London, embodying the themes of greed and manipulation that permeate the story. Onan's interactions with the protagonist, Dodger, highlight the challenges and moral dilemmas faced in a city rife with corruption and social injustice. His character adds depth to the narrative, showcasing the darker aspects of the society in which Dodger navigates.