One of the three Furies disguised as a pre-algebra teacher. Hunts Percy at Yancy Academy.

Food service worker at Yancy Academy who serves lunch to the students.

Percy's Latin teacher at Yancy Academy. Uses a wheelchair and takes a special interest in Percy's...

Adult supervisor who manages the dormitory at Yancy Academy and enforces curfew rules.

The psychic connection between Percy and Grover that allows them to sense each other's emotions and...

Percy's English teacher at Yancy Academy who struggles with Percy's dyslexia and reading...

Percy's best friend at Yancy Academy. Walks with crutches and is frequently bullied. Seems nervous...

Physical education teacher at Yancy Academy who runs sports activities and fitness classes.

Student hall monitor at Yancy Academy who reports troublemakers to the administration.

History instructor at Yancy Academy who teaches about ancient civilizations and cultures.

A classmate of Percy at Yancy Academy who attends the same classes and field trips.

The school janitor at Yancy Academy who cleans up after student incidents and mishaps.

The school librarian at Yancy Academy who maintains the books and helps with research.

Additional math support teacher who helps Percy with his algebra struggles at Yancy Academy.

A bully at Yancy Academy who picks on younger students and enjoys tormenting Percy.

Another student at Yancy Academy who witnesses Percy's various school incidents.

The headmaster of Yancy Academy. Stern administrator who deals with Percy's disciplinary issues.

A red-headed kleptomaniac girl at Yancy Academy who bullies other students and picks on Percy.

A twelve-year-old boy with dyslexia and ADHD attending Yancy Academy. Has a bad temper and gets...

Assistant principal at Yancy Academy who handles student discipline and behavior issues.

A student at Yancy Academy who shares classes with Percy and goes on school trips.

The nurse at Yancy Academy who treats student injuries and handles medical issues.

Percy's science teacher at Yancy Academy who teaches chemistry and biology courses.

Teacher who supervises study hall periods and maintains quiet study environments.

Three ancient sisters who punish those who break sacred laws. Alecto is one of them hunting Percy.

Percy's roommate at Yancy Academy who shares the dormitory room and witnesses Percy's odd behavior.