A tall, athletic boy of the same age as Julie, initially portrayed as cocky and immature, who undergoes significant personal growth throughout the story, forming a close bond with Julie.

Julie’s father, described as an "overgrown kid" with a passion for diving, whose entrepreneurial dreams impact his family relationships, and who plays a crucial role in teaching Julie valuable life skills.

Shane’s father, characterized as wealthy, arrogant, and unwilling to listen, whose actions and attitudes serve as a foil to Julie’s responsible nature and influence events in the narrative.

Julie’s mother, a lawyer from Atlanta, who has a strained relationship with her ex-husband due to differences in ambition, and whose love for her daughter is evident despite her busy schedule.