Ross's best friend known for her bold personality and love of eccentric clothing and music, who encourages Ross to embrace his differences and cease caring about others' opinions.

Ross's large and abrasive classmate, who initially seems to be a typical bully but gradually reveals a more complex and supportive side.

Sources of stability in Ross's life, with his father being a busy trial lawyer and Linda, his stepmother, showing care and understanding without expecting to replace Ross's late mother.

A radiation tech passionate about rock music, who mentors Ross and encourages him to express himself authentically through music.

A retiree undergoing radiotherapy, who connects with Ross over their shared cancer experience and offers wisdom and support.

A popular girl at Ross’s school and his longtime crush, whose outward perfection eventually reveals a more superficial nature.

Ross's friend, who is absent for much of the story due to feeling overwhelmed by Ross's cancer diagnosis but later reconciles with Ross and Abby.