Richard Enfield is Utterson's cousin and is a well known "man about town." He first sees Hyde at about three in the morning in an episode that is well documented as Hyde is running over a little girl. He is the person who mentions to Utterson the actual personality of Jekyll's friend, Hyde. Enfield witnessed Hyde running over a little girl in the street recklessly, and the group of witnesses, with the girl's parents and other residents, force Hyde into writing a cheque for the girl's family. Enfield discovers that Jekyll signed the cheque, which is genuine. He says that Hyde is disgusting looking but finds himself stumped when asked to describe the man.
Although Dr. Jekyll and Mr. Hyde is widely recognized as a monumental piece of fiction, Stevenson's concept of duality within human identity was not completely originally. In fact, he had encountered precursors to his tale long before he wrote the novel. Most frequently as influential to the development of Stevenson's work are . Hoffman's The Devil's Elixirs (1816), Thomas Jefferson Hogg's The Private Memoirs and Confessions of a Justified Sinner (1824), Edgar Allan Poe's William Wilson (1839), and most significantly, Theophile Gautier's Le Chevalier Double (1840). Gautier's story centers on the protagonist, Oluf, who has a double nature and leads a tormented life, much like Jekyll and Hyde.