Annie is a young nurse who carries physical and emotional scars from a childhood accident at the Ruby Pier amusement park. She lost her left hand during the incident, an event that deeply shapes her self-esteem and her relationship with her mother. Believing her life consists mostly of errors and guilt, she struggles to see her own worth, though she demonstrates immense empathy and dedication in her medical career. When a tragic hot air balloon accident leaves her husband critically injured, she offers to donate her lung to save him, falling into a coma during the surgery.

Lorraine is Annie's mother, a woman who survives an abusive marriage only to become intensely protective of her daughter. Following the accident at Ruby Pier, she moves Annie to Arizona and establishes a highly isolated, strictly guarded daily routine. Her fear of failing again makes her highly controlling, pushing her daughter away and creating a deep emotional distance between them.

Paulo is Annie's childhood friend who reconnects with her in adulthood and becomes her husband. He possesses an optimistic, gentle nature and is the only person from Annie's youth who views her physical injury as a unique trait rather than a flaw. He acts as a grounding presence, offering her unconditional acceptance and encouraging her to see her own value.

Eddie is an elderly maintenance worker from the Ruby Pier amusement park who sacrificed himself to save an eight-year-old Annie from a falling ride. He is a gruff but compassionate man who spent much of his life feeling unimportant before finding his true calling in protecting children. His actions on the day of the accident leave a lasting impact on Annie's physical and emotional life.

Cleo is a shelter dog recovering from surgery when a young, lonely Annie adopts her. Because they share physical wounds and a sense of isolation, the dog and the young girl form an immediate, deeply empathetic bond. Cleo provides Annie with essential comfort and unconditional love during a highly restrictive childhood.

Sameer is the surgeon responsible for reattaching Annie's hand after the Ruby Pier accident. He lost his own arm as a child while recklessly chasing a train, an event that pushed him to pursue a career in medicine. He pioneers new surgical techniques that eventually benefit countless patients, illustrating how early mistakes can lead to significant positive impacts.

Tolbert runs a local hot air balloon company. His brief, seemingly random interaction with the newlyweds on the highway sets off a chain of events that drastically alters their weekend plans when he gives them his business card.

Jerry is Annie's father, an unpredictable man who creates a volatile environment in Annie's early childhood home. His violent outbursts eventually push Lorraine to file for divorce and move across the country. He later attempts to capitalize financially on his daughter's tragic accident at the amusement park.

Walt is Annie's first boyfriend and eventual husband. He owns a car and provides Annie with the attention and independence she desperately craves right after leaving her mother's strict household. However, he offers little emotional support during the most difficult times of their brief marriage.

Teddy is Tolbert's novice assistant at the hot air balloon company. He takes charge of a flight when his boss is delayed, leading to a precarious situation in the air when the weather turns dangerous.

Tala is a young girl from a village in the Philippines. Her story intersects with Eddie's past during his military service in World War II, heavily influencing his sense of guilt and his subsequent life choices.

Marguerite is Eddie's beloved wife who passed away while only in her forties. Her early death leaves a lasting impact on Eddie's worldview and heavily influences his emotional state during his time working at the amusement park.