Eleanor Campbell is the youngest daughter of Viscount Campbell, making her a member of the British peerage in Victorian-era London. Despite her family's noble title, their financial situation is deteriorating, which places Eleanor in a precarious social position where wealth and status are in a delicate balance. She is a beautiful young woman with waist-length blonde hair, often styled in a braided bun, and emerald-green eyes.

In terms of personality, Eleanor is defined by her profound shyness, particularly in social situations and romantic contexts. She struggles with social anxiety, fretting over minor details such as the selection of gloves and often stammering when in the presence of William Jones, the man she loves. Her shy nature coexists with a persistent determination to capture William's attention. She employs various strategies to be near him, such as inviting him to tea at her mansion or visiting his home under the pretense of seeing the roses bloom. These attempts are frequently reinforced by misunderstandings, as she interprets William's courteous and accommodating behavior as a sign of returned affection, when in reality he is simply being polite.

Eleanor's primary motivation is driven by a combination of genuine romantic feeling and significant external pressure. She genuinely falls in love with William after meeting him during her social debut. However, this personal affection is heavily intertwined with her family's desperate need for financial stability. Her father, Viscount Campbell, despite his contempt for those outside the aristocracy, is eager for Eleanor to marry into the wealthy, though lower-class, Jones family to secure their finances. Her mother also actively propels her toward this marriage alliance. Eleanor thus finds herself clinging to the romantic ideal of marriage as both a personal fulfillment and a dutiful solution to her family's problems, interpreting her persistence as a virtue.

Within the story, Eleanor serves as a significant obstacle to the central romance between William Jones and the maid Emma. She is positioned by both families as the appropriate match for William, representing the socially acceptable path that contrasts sharply with William's forbidden love for a servant. Her role evolves from a shy but hopeful suitor to a more complex figure whose emotional journey reflects the constraints placed upon women of her class.

Her key relationship is with William Jones, the heir to a merchant family, whom she loves unrequitedly. This relationship eventually leads to a formal engagement, though William's heart belongs to another. Eleanor is almost always accompanied by her faithful servant, Annie, who has cared for her since childhood and represents a constant, loyal presence in her life. Her family includes her parents, Viscount and Lady Campbell, and her two older sisters, Sophia Bradford and Monica Mildrake.

Eleanor undergoes notable development throughout the narrative. Initially depicted as a shy young woman with selective blindness to William's true feelings, she eventually gains a clearer understanding of the situation. When faced with the depth of William's devotion to Emma, she is forced to confront the artifice of her own aspirations. Her decision to relinquish the arranged marriage becomes an act of defiance against the social systems that shaped her, representing a transformation from obsessive longing to a more dignified clarity. By the end of her arc, Eleanor retreats with a sense of honor, recognizing the boundaries of love and choosing to step away rather than continue a performative courtship. Her journey is not one of grand rebellion but rather a silent recognition of the truth, framing her not as a villain but as a product of her era's crushing social expectations. While she possesses no notable special abilities, her social standing and family name are her primary sources of influence in the world of the story.