Julia's best friend and neighbor, a white boy who is interested in her Korean heritage and helps research their silkworm project. He is motivated to overcome his fear of worms and is supportive of Julia throughout the story.

A retired Black man who owns a mulberry tree and becomes friends with Julia and Patrick as they work on their silkworm project. He serves as a mentor to them, providing guidance in both gardening and cultural understanding.

Head of the Wiggle Club and a sustainable farmer, he mentors Patrick and Julia on their project but struggles to fully understand Julia's concerns. His perspective highlights challenges related to privilege and understanding immigrant experiences.

Julia’s young brother who joins the silkworm project, offering fresh insights and showing unexpected compassion. His actions and reflections contribute positively to the project and Julia’s evolving relationships.

The author’s self-insert character who appears to discuss the story with Julia, offering insights into the creative writing process and imparting lessons in empathy and teamwork. Her interactions with Julia are integral to the storyline.