Grover Underwood is a satyr and Percy's best friend. In the musical, he is portrayed by Chris McCarrell.
In the films, he is portrayed by Logan Lerman. He appears in The Lightning Thief, The Sea of Monsters, The Titan's Curse, The Battle of the Labyrinth, The Last Olympian, The Son of Neptune, The Mark of Athena, The House of Hades, The Blood of Olympus, The Hidden Oracle, The Tower of Nero, The Son of Sobek and The Crown of Ptolemy. Percy is the first-person narrator in the Percy Jackson & the Olympians series. Percy also found love at the end of The Last Olympian. Later, she married Paul Blofis, whom she genuinely loves, and they have a daughter named Estelle. At the end of The Lightning Thief, Sally turned Gabe into stone using Medusa's head. His repugnant mortal odor masked Percy's demigod scent, hiding him from monsters. Additionally, his mother was once married to Gabe Ugliano (Smelly Gabe) an abusive, gambling-addicted, alcoholic in order to protect Percy. This made him the subject of bullying from his peers. He, like most demigods, was diagnosed with ADHD and dyslexia. Riptide, the sword, has been made by Zoë Nightshade. The pen can change into a celestial bronze sword and if he loses it, it will always appear back in his pocket. Throughout the series, Percy uses a ballpoint pen named Anaklusmos (Ancient Greek for "Riptide") for battle. He is also a gifted swordsman using his shape-shifting sword pen. He has inherited special abilities from Poseidon which include the ability to control water, boats, and ships to create small hurricanes to breathe and see clearly underwater, and to talk to horse-like creatures and most aquatic animals.
Percy lives in the Upper East Side of Manhattan and is a New York Yankees fan, but found his life uprooted upon discovering his true paternity. Percy Jackson is a demigod, son of the mortal, Sally Jackson, and the Greek God of the sea, Poseidon. 2.2 Introduced in The Heroes of Olympus.2.1 Introduced in Percy Jackson and the Olympians.