The compassionate third-grade teacher who uses a "halo" competition to encourage good behavior in her students, emphasizing the value of intrinsic goodness and morality.

Suds’s supportive and understanding mother, who helps him navigate his emotional struggles and reinforces the values of empathy and integrity.

Suds’s younger sister, nicknamed “Zippernose,” who embodies typical sibling rivalry and serves as a catalyst for Suds’s self-reflection and growth.

A new student in Suds’s class whose contrasting personality and attitudes towards authority create tension and foreshadow his role in the linked story, Fourth Grade Rats.

A fellow classmate and object of Suds’s affection, who remains indifferent to his feelings despite his long-standing admiration.

A minor character who plays a crucial role in advancing Suds’s understanding of genuine kindness through her selfless actions.