Bat's older sister, who is creative and outgoing with a passion for singing and acting, which plays a significant role in the story. Her relationship with Bat highlights their sibling bond and individual differences.

Bat and Janie's mother, a veterinarian whose nurturing and understanding nature supports Bat's love of animals. She often provides a safe and comforting environment for her children.

Bat and Janie's father, characterized by his detail-oriented nature and love for baseball, despite Bat's disinterest. He is portrayed as well-intentioned yet struggles to fully connect with Bat.

Bat's best friend, known for his cheerful demeanor and capacity for forgiveness, who plays a key role in Bat's social development. His support and friendship are crucial throughout the story.