Perseus "Percy" Jackson is introduced as a troubled 12-year-old boy who is a student with dyslexia, which makes it hard for him to read, and ADHD (Attention Deficit Hyperactivity Disorder), which makes it hard for him to pay attention. He has been kicked out of every single school he has gone to. He has just been kicked out of Yancy Academy in Upstate New York. He has few friends at the school, his best friend being Grover Underwood, a satyr (half human, half goat) disguised as a human.