Sherlock Holmes is a brilliant, emotionally vulnerable, and somewhat messy detective who ultimately learns to accept his sister's invaluable help.

Viscount Tewkesbury is a progressive, flower-loving lord who champions social reform in the House of Lords and acts as Enola's steadfast romantic ally.

Eudoria is Enola’s brilliant, fiercely independent, and radical suffragette mother. She operates secretly to fight for social change.

Edith is a skilled jiu-jitsu master, tea shop owner, and fierce activist who mentors Enola and aids her dangerous escape.

Bessie is a brave, impoverished young matchstick factory worker who becomes Enola’s first client by asking her to find her missing sister.

Mae is a matchstick factory worker and Paragon Theatre dancer. She is a loyal friend to Sarah Chapman involved in a dangerous political conspiracy.

Sarah Chapman is a brave matchstick factory worker who uncovers a deadly corporate conspiracy, leading her fellow women on a historic strike.

William Lyon is the match factory owner's son who allies with Sarah Chapman to expose deadly factory conditions and corruption.