A finance controller for Michigan state, often perceived as dull by Zoe, with whom she shares moments of bonding over classical music.

An emotionally expressive character with a mental illness that confines him mainly to the home, and who inadvertently introduces Zoe to the organ.

A messy-haired classmate who turns into a good friend of Zoe and develops an unexpected friendship with her father.

Zoe's piano teacher, known for her initially stern demeanor, who helps Zoe develop confidence and skill in playing music.

A former best friend of Zoe who leaves her for another companion, inadvertently pushing Zoe towards more meaningful friendships.

A kind acquaintance Zoe meets at a music competition, offering simple yet effective advice that helps Zoe overcome performance anxiety.