Owen is Emma's older brother and her supportive rock, who moves ahead with his life by attending public high school, participating in activities like theater and sports, while maintaining a close bond with Emma through their shared adventures.

Jack is a fifth grader with noticeable physical tics and a love for animals; he challenges Emma's initial expectations and eventually becomes a genuine friend through his kindness and authenticity.

Lapi is a small, domesticated rabbit that Emma rescues, symbolizing comfort and connection to her late grandfather, and facilitates Emma's growth and friendships.

Leah and Iris are fifth-grade classmates of Emma, whom she initially aspires to befriend due to their appearances fitting her ideal image of friends, though their dynamics evolve throughout the story.