Winterbourne - An American in his late twenties and a long-time resident of Geneva who meets the title character on a visit to Vevey.
Daisy Miller - A young American from New York traveling to Europe with her mother and younger brother.
Mrs. Miller - A nervous matron traveling alone with her two children, with only the help of their courier, Eugenio, to keep them out of trouble.
Randolph Miller - Daisy's nine-year-old brother is assertive, headstrong, and in many ways a typical American child rampaging across Europe but not appreciating it.
Mrs. Costello - Winterbourne's aunt who has spent enough time in Europe to identify with its customs and social conventions.
Mrs. Walker - Another wealthy expatriate American, she resides in Rome and is friends with both the Miller family and Winterbourne.
Mr. Giovanelli - A handsome, shady Italian who befriends Daisy in Rome. Daisy is...
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