Henry Higgins is a professor of phonetics and an expert in dialects who takes on the experiment of transforming Eliza Doolittle's speech. Though brilliant in his field, he often lacks manners and sensitivity towards others.

Alfred Doolittle is Eliza’s father, a dustman with a humorous and candid outlook on life. His character provides commentary on class and societal expectations.

Colonel Pickering is a gentleman and fellow phonetics enthusiast who supports Higgins in his experiment with Eliza. He is known for treating Eliza with kindness and respect.

Freddy Eynsford Hill is a young man from a genteel but impoverished family who becomes infatuated with Eliza. His character contrasts with Higgins, as Freddy treats Eliza with admiration.