A kind and studious high school student who is one of the narrators, discovering more about Hannah and their classmates through her tapes.

A teenager who drives a classic Mustang and holds an important role in ensuring Hannah's tapes are listened to by those intended.

A basketball player whose actions play a significant role in the events affecting Hannah, as documented in her tapes.

A new student at Crestmont High who becomes part of Hannah's story through a misunderstanding and subsequent rumor.

A friend of Hannah's and Alex who becomes involved in a complex situation that influences the narrative through her actions.

An accomplished photographer whose actions contribute to the themes of perspective and privacy in the story.

A popular student who appears sweet but reveals self-serving behavior, impacting Hannah's life through rumors.

A classmate known for his humor, but his actions during a date with Hannah lead to significant emotional harm.

A classmate who, despite being perceived as nice, makes a decision that affects Hannah's sense of community and worth.

A poet and editor of the school gazette who has a shared passion for poetry with Hannah, leading to a breach of trust.

A cheerleader who is involved in events that dramatically affect Hannah and illustrate issues of responsibility and safety.

A notorious student with a negative reputation, whose actions are central to understanding the environment surrounding Hannah.

An English teacher and guidance counselor who represents the adult authority in the story, interacting with Hannah professionally.

Clay's former crush who represents another important character in Hannah's social environment, and with whom Clay reconnects later.