What are the names of 3 main characters in Percy Jackson and Lightning Thief?

The three main characters in *Percy Jackson and the Lightning Thief* are:

1. Percy Jackson: The protagonist and a demigod son of Poseidon.

2. Annabeth Chase: A demigod daughter of Athena, Percy's close friend and teammate.

3. Grover Underwood: A satyr and Percy's best friend and protector.