Holly, Haley's best friend, is a vibrant and talkative foil to Haley's introspection. Despite being criticized for materialism, she emerges as a generous and supportive friend who helps Haley navigate her personal challenges.

Amari is a humorous and insightful member of the ARTT group. He creatively names the ARTT room and plays a key role in bonding the group. His growth is marked by his transition from teasing to using his artistic talents to unify friends.

Ashton, the only White boy in his Brooklyn school, faces bullying and identity challenges. His character evolves through engaging discussions, where he finds belonging and support among his ARTT friends.

Esteban is central to the ARTT group's dynamic, as the story of his father's detainment by immigration prompts their creation. His shared experiences with his father's love for poetry strengthen the group's bond, despite his physical absence later in the story.

Tiago, a less talkative Puerto Rican member of the ARTT group, reveals his strength when sharing personal stories about discrimination and loss. His vulnerability and supportive actions underscore the group’s journey to maturity.