A respected doctor and scientist who is very concerned with being well regarded. He is curious, interested in the paranormal. He can transform into his alter ego, Mr Hyde.

The alter ego of Jekyll, who emerges after Jekyll takes his potion. Physically repellent, he is violent, rude, and interested only in his own pleasure.

A respectable lawyer. His mind is rather dull and dry, but he acts decisively and is considered reliable and trustworthy.

A medical doctor and previously a friend of Jekyll. He is firmly rational and has no patience with the paranormal or Jekyll’s interest in it.

A cousin and friend of Utterson’s who prefers a quiet life and avoids involvement in anything he considers abnormal.