Judy's younger brother, who provides a humorous sibling rivalry dynamic while being supportive and present in Judy's adventures. He is content with his own version of recognition and helps Judy in unexpected ways.

Jessica is Judy's classmate and academic rival, whose accomplishments initially fuel Judy's desire for fame. Despite this perceived competition, Jessica's presence helps propel Judy toward her growth and self-discovery.

Frank is one of Judy's closest friends and classmates who supports her through her endeavors. His easygoing nature provides a calming balance to Judy's dramatic personality.

Judy's parents serve as supportive figures in her life who encourage her exploration and growth. They offer a steady background presence that contrasts with Judy's energetic spirit.

Mr. Todd is Judy's understanding and patient teacher who subtly guides his students and teaches Judy significant lessons, including the concept of being "infamous."