Lara Jean is a high school senior anticipating her transition to college. As a mixed-race Korean American, she values her family's heritage and maintains a close bond with her sisters following their mother's passing. She copes with stress by perfecting her chocolate chip cookie recipes and relies heavily on planning her future, particularly envisioning a college experience alongside her boyfriend.

Peter is a popular high school senior and dedicated lacrosse player who holds a sports scholarship to the University of Virginia. He is thoughtful and attentive toward his girlfriend, maintaining a gentle dynamic that contrasts with his athletic public persona. He struggles with his relationship with his absent father, who has remarried and started a new family.

Daniel is a doctor and a dedicated single father raising three daughters after the death of his first wife, Eva. Known affectionately as "Daddy" to his girls, he is an easygoing and warm-hearted parent who values simple family traditions. He seeks to build a new life with his neighbor, balancing his romantic aspirations with his commitment to his children.

Margot is the eldest Covey sister, currently studying abroad at St. Andrews University in Scotland. Mature and independent, she often acts as a mother figure and touchstone for her younger siblings. Returning home for visits, she struggles to find her place in the shifting family dynamic and resists changes to the household.

Kitty is the youngest Covey sister, known for her outspoken, confident, and sometimes spiky personality. Because she was very young when their mother died, she relies heavily on older female role models and eagerly embraces her father's new relationship. She fiercely defends her family and possesses a strong, independent sense of style.

Trina is the Coveys' neighbor who has developed a serious romantic relationship with Daniel. She is active, straightforward, and drinks Fresca regularly. Trina integrates into the Covey household, acting as a supportive mother figure to Kitty while navigating the complex boundaries of joining an established family.

Chris is a free-spirited high school senior who works as a server at Applebee's and favors spontaneous adventures. Rather than pursuing a traditional university path, she plans to travel and work with community groups in Central and South America. She serves as a wild, impulsive counterpoint to her more cautious best friend.

Stormy is an elderly resident at the Belleview retirement home with a colorful past. She serves as a mentor and friend to Lara Jean, offering wisdom about living life boldly and seizing opportunities.

John Ambrose is a former friend and love interest of Lara Jean who reappears in her life. He is polite, level-headed, and planning his own college transition while navigating a long-distance relationship with a girl he met at Model UN.

Lucas is an openly gay friend of Lara Jean who provides practical advice and emotional support. He plans to move to New York after graduation and maintains a realistic perspective on the temporary nature of high school friendships.

Pammy is a friend of Lara Jean who participates in school events and takes on a maternal, organizing role during the senior class beach trip.

Ravi is a tall, sophisticated British man of Indian descent. He is vegetarian, polite, and enthusiastically embraces American tourist experiences like visiting museums in Washington, D.C.

Genevieve is Peter's ex-girlfriend and a former friend of Lara Jean. Their shared history creates lingering tension and insecurity, particularly regarding relationship milestones.

Peter's mother runs a furniture shop and actively manages her son's future. She is highly protective of his athletic scholarship and prospects, leading her to intervene in his personal relationships to ensure his success.

Peter's father is a divorced parent who moved away and started a new family. He makes sporadic, sometimes secret attempts to reconnect with his older son, though his past absence causes lingering resentment.

Owen is Peter's younger brother. He occasionally interacts with the younger Covey sister, though they pretend not to know each other in public settings.

Josh is Margot's ex-boyfriend and a former crush of Lara Jean. Though he is largely absent from their daily lives now, his past relationships with the sisters still occasionally surface in conversation.

Kristen is Trina's best friend. She helps plan wedding celebrations and advocates for traditional pre-wedding festivities like bachelorette parties.

Dipti is a smart, well-put-together student from Michigan who enters into a long-distance relationship as she and her boyfriend prepare for college.