Aubrey is a wealthy young orphan raised by negligent guardians. Nurtured on romance novels and poetry, he views the world through a highly idealized, naive lens. His romantic sensibilities give him a strong sense of honor but blind him to the harsh realities and predatory natures of those around him, particularly within high society.

Lord Ruthven is a mysterious, charismatic aristocrat who suddenly appears in London society. Characterized by his dead grey eye and aloofness, he possesses a magnetic charm that draws in wealthy gamblers and virtuous women alike. He travels the continent with his younger companion Aubrey, frequently seeking out centers of fashionable vice.

Ianthe is a beautiful, delicate young woman living in rural Greece. She possesses an ethereal, fairy-like innocence that enchants Aubrey. Unaccustomed to the stifling drawing rooms of high society, she is closely connected to the natural world and earnestly believes in local folklore, warning travelers about supernatural dangers.

Aubrey's Sister is an eighteen-year-old aristocratic woman preparing to enter high society. In contrast to more ethereal beauties, she possesses a sedate, pensive demeanor and a melancholy charm. Her primary focus is her devotion to her older brother, often striving to comfort and distract him from his anxieties.

Lady Mercer is a married aristocratic woman in London society known for her adulterous behavior. She functions as a subject of mockery in drawing-rooms due to her lack of virtue. She attempts to seduce Lord Ruthven but is publicly rebuffed, failing to hold his interest.

Aubrey's Guardians are the caretakers responsible for overseeing the young orphan and his sister. They manage the siblings' estate and affairs, though they are generally negligent in providing actual guidance during Aubrey's formative years. They intervene primarily through letters when Aubrey's reputation is at risk.