Andrea is the co-founder and editor-in-chief of The Plunge, a highly successful, high-end wedding magazine. Although it has been ten years since she quit her grueling job as an assistant at Runway magazine, she continues to suffer from severe anxiety and nightmares about her former boss. She prepares to marry media heir Max Harrison but struggles with private doubts after discovering a disparaging letter written by his mother.

Emily is the fiercely ambitious and status-conscious co-founder of The Plunge. Like Andrea, she is a survivor of Miranda Priestly's tyrannical management at Runway, but she views her past trials as a necessary stepping stone to high-society success. She prioritizes professional prestige and financial gain, constantly pushing to expand the magazine's corporate influence. Her belief that personal boundaries should be sacrificed for elite status frequently puts her at odds with her business partner.

Miranda is the formidable and brilliant editorial director of Elias-Clark, the parent company of Runway magazine. She wields absolute authority in the high-fashion publishing world, using a blend of subtle charm and overt intimidation to maintain control over her empire. She commands her staff through rapid-fire directives and instills lasting psychological fear in her subordinates. Her sudden interest in acquiring The Plunge forces her former assistants to confront her despotic influence once again.

Max is the charming CEO of Harrison Media Holdings and the primary financial backer of The Plunge. He stepped into his role following his father's death and faces intense pressure to restore his family's flagging fortunes. While he presents himself as a supportive partner, his dynastic responsibilities and secretive actions introduce tension into his impending marriage.

Barbara is Max's mother, a wealthy and traditional matriarch steeped in old-money prejudices. She views marriage strictly as a strategic merger to protect family lineage and assets, openly dismissing professional ambition in women. Her active disdain for her son's chosen partner is documented in a handwritten letter left in Max's hotel suite, creating immediate hostility and doubt surrounding the wedding.

Nigel is a flamboyant, witty, and impeccably dressed veteran of the fashion industry. He serves as a direct link to Andrea's traumatic past at Runway, remaining entirely devoted to Miranda Priestly's elite circle. His unquestioning loyalty to his boss highlights the insular, inescapable nature of the high-fashion publishing world.

Alex is Andrea's former college boyfriend who moved away after their breakup years ago. Having recently finished his master's degree, he is preparing to return to New York to work as a vice-principal at an elite private school called Imagine. He represents a grounded, authentic period of Andrea's life before she became entangled in the superficiality of high-society media.

Christian is a wealthy writer and a figure from Andrea's past who operates comfortably within Manhattan's elite social circles. Confident and unapologetically flirtatious, he represents the glamorous but emotionally hollow social scene that Andrea increasingly questions.

Lily is Andrea's oldest friend, residing in Colorado and far removed from the high-pressure New York media world. Having overcome her own past struggles with addiction, she provides a grounded, nonjudgmental perspective on life. She serves as a crucial confidante who encourages Andrea to confront the messy realities of her life rather than striving for curated perfection, offering advice that cuts through the superficiality of the fashion industry.

Katherine is Max's wealthy ex-girlfriend, an heiress favored heavily by the Harrison matriarch. She recently crossed paths with Max during his bachelor party in Bermuda, an encounter that was kept secret and subsequently sparks intense insecurity and conflict in his current relationship.

Miles is Emily's husband, operating in the same affluent New York circles as the Harrison family. He shares his wife's pragmatic approach to business and social climbing, frequently aligning with corporate interests over personal sentiments.

Stanley is the general counsel for Elias-Clark, the massive publishing conglomerate that owns Runway. He acts as the corporate enforcer for Miranda Priestly's acquisition strategies, handling the intimidating legal maneuvers required to buy out competing publications.

Sophie is a young woman who attends a support group where she openly confesses her relationship struggles. Her candid admissions about infidelity stand in sharp contrast to the highly curated, secretive lives of the elite media figures surrounding the magazine.

Jill is Andrea's older sister. She provides a sense of normal family grounding outside the intense pressures of the New York publishing scene, frequently checking in on her sibling's emotional state during high-stress events.

Ida is Andrea's grandmother. She provides a touch of humor and generational perspective during tense family gatherings, representing the genuine family bonds that contrast with the strategic alliances of the Harrison dynasty.