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Characters

Dr Henry Jekyll/Edward Hyde

The dual title character, a doctor who has covered up a secret life full of cruel deeds. He feels as if he is constantly battling within himself between what is good and what is evil, and is pushing away people dear to him. After drinking a potion of his own creation, Jekyll is transformed into the smaller, younger, cruel, remorseless, evil Edward Hyde, representing the hidden side of Dr Jekyll's nature brought to the fore. Dr Jekyll has many friends and has a friendly personality, but as Mr Hyde, he becomes mysterious, violent, and secretive. As time goes by, Mr Hyde grows in power. After taking the potion repetitively, he no longer relies upon it to unleash his inner demon.

Stevenson never says exactly what Hyde takes pleasure in on his nightly forays, saying generally that it is something of an evil and lustful nature; thus it is in the context of the times, abhorrent to Victorian religious morality. Hyde may have simply been reveling in activities that were not appropriate to a man of Jekyll's stature, such as engaging with prostitutes or burglary, or perhaps merely walking the dark streets of London all night and sleeping during the day. The same potion that turns Jekyll into Hyde also turns him back into Jekyll - at first - but Jekyll finds himself spontaneously turning into Hyde and requiring greater doses of the potion to turn himself back. When the original batch runs out, Jekyll frantically scours the pharmacies of London looking for the same ingredients he originally used, but ultimately realizes one of the original components had a unique imperfection that could not be duplicated - therefore, he can never recreate the exact formula. Realizing he will soon be Hyde forever, he leaves behind a testament before committing suicide by poison; pointing out that while Jekyll often felt like a charlatan, Hyde felt like a "genuine man" years younger and far more energetic than his more "sociable" self. He also states in his final confession that although Hyde knew people recoiled from him, he didn't care.

Dr Lanyon

A former (medical) friend of Jekyll's, Hastie Lanyon disagrees with his "scientific" concepts, which Lanyon describes as "...too fanciful". He is the first person to whom Hyde's identity is revealed (Hyde transforms himself back into Jekyll in Lanyon's presence). Dr Lanyon helps Utterson solve the case, when he describes the letter given to him by Jekyll. When Lanyon witnesses the transformation process, (and subsequently hears Jekyll's private confession, made to him alone), Lanyon becomes critically ill and later dies of shock.

Mr Utterson

Gabriel John Utterson, a lawyer and loyal friend of Jekyll's (and Lanyon's), is the character the narrator focuses on, and follows in his quest to discover the identity of Hyde. In most adaptations of the novel, he is omitted and replaced by Dr Lanyon.^{[citation needed]} Utterson is described as a measured, and at all times emotionless, bachelor; who is nonetheless believable, trustworthy and indeed likable.

Poole

Poole is Dr Jekyll's butler who, upon noticing the reclusiveness and changes of his master, goes to Mr Utterson with the fear that his master has been murdered and his murderer, Mr Hyde, is residing in his chambers. Poole serves Jekyll faithfully, and attempts to do a good job and be loyal to his master. Yet events finally drive him into joining forces with Utterson to discover the truth.

Richard Enfield

Richard Enfield is Mr Utterson's acquaintance. He is the person who mentions to the lawyer the actual personality of Jekyll's heir, Mr Hyde. Enfield witnessed Hyde walking over a little girl in the street, and he, with the girl's parents and other residents, force Hyde into writing a cheque for the girl's family. Enfield discovers that the cheque was signed by Dr Jekyll. He said Hyde was disgusting looking.

Inspector Newcomen

This Scotland Yard inspector is joined by Mr Utterson, after the murder of Sir Danvers Carew. They explore Hyde's loft in Soho and discover evidence of his depraved life.

Sir Danvers Carew

A kind old man and important member of Parliament. He was killed in the streets of London by Mr Hyde in a murderous rage. In many adaptations of the story, Sir Danvers is the father of Jekyll's fiancée. The book makes no such connection and Hyde's murder of Sir Danvers is described as a wanton act of violence.