Professor Henry Higgins
Henry Higgins is a professor of phonetics who plays Pygmalion to Eliza Doolittle's Galatea. He is the author of Higgins' Universal Alphabet, believes in concepts like visible speech, and uses all manner of recording and photographic material to document his phonetic subjects, reducing people and their dialects into what he sees as readily understandable units. He is an unconventional man, impatient with high society, forgetful in his public graces, and poorly considerate of normal social niceties.
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Eliza Doolittle
Eliza Doolittle defies any conventional notions we might have about a romantic heroine. When she is transformed from a smart-mouthed flower girl with deplorable English, to a (still sassy) regal figure fit to consort with nobility, it has less to do with her innate qualities as a heroine than with the fairy-tale aspect of the transformation myth itself. In other words, the character of Eliza Doolittle comes across as being much more instrumental than fundamental. The real (re-)making of Eliza Doolittle happens after the ambassador's party, when she decides to make a statement for her own dignity against Higgins' insensitive treatment.
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Colonel Pickering
Colonel Pickering is a match for Higgins (although somewhat less obsessive) in his passion for phonetics. But where Higgins is a boorish bully, Pickering is always considerate and a genuine gentleman. He says little of note in the play, and appears most of all to be a civilized foil to Higgins' barefoot, absentminded crazy professor. He helps in the Eliza Doolittle experiment by making a wager of it, saying he will cover the costs of the experiment if Higgins does indeed make a convincing duchess of her. However, while Higgins only manages to teach Eliza pronunciations, it is Pickering's thoughtful treatment toward Eliza that teaches her to respect herself.
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Alfred Doolittle
Alfred Doolittle is Eliza's father, a dustman who has had at least six wives and who "seems equally free from fear and conscience." His unique brand of rhetoric, an unembarrassed, unhypocritical advocation of drink and pleasure (at other people's expense), amuses Higgins. Through Higgins' joking recommendation, Doolittle becomes a richly endowed lecturer to a moral reform society, transforming him from lowly dustman to a picture of middle class morality, and he becomes miserable. Alfred is a scoundrel who is willing to sell his daughter to make a few pounds, but he is one of the few unaffected characters in the play, unmasked by appearance or language.
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Mrs. Higgins
Professor Higgins' mother, Mrs. Higgins is a stately lady in her sixties who sees the Eliza Doolittle experiment as idiocy, and Higgins and Pickering as senseless children. She is the first and only character to have any qualms about the whole affair. When her worries prove true, it is to her that all the characters turn. Because no woman can match up to his mother, Higgins claims, he has no interest in dallying with them. To observe the mother of Pygmalion (Higgins), who completely understands all of his failings and inadequacies, is a good contrast to the mythic proportions to which Higgins builds himself in his self-estimations as a scientist of phonetics and a creator of duchesses.
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Freddy Eynsford Hill
Higgins' surmise that Freddy is a fool is probably accurate. In the opening scene he is a spineless and resourceless lackey to his mother and sister. Later, he is comically bowled over by Eliza, the half-baked duchess who still speaks cockney. He becomes lovesick for Eliza, and courts her with letters. At the play's close, Freddy serves as a young, viable marriage option for Eliza, making the possible path she will follow unclear to the reader.