Needing a break, Percy wanders to the training arena to visit Mrs. O'Leary, his hellhound. When he arrives there, Ms. O'Leary runs into the forest, causing Percy to chase after her. He follows her to the clearing where the Lords of the Wild hold their meetings. There, Percy finds Nico, Leneus, one of the Council of Cloven Elders members, and Grover's girlfriend Juniper talking about Grover. Morpheus - God of dreams. He sided with Kronos in the second Titan war and put the entire city of Manhattan to sleep.

Graphic novels based on each book of the series have been released: The Lightning Thief on October 12, 2010, The Sea of Monsters on July 2, 2013, The Titan's Curse on October 8, 2013, The Battle of the Labyrinth on October 2, 2018, and The Last Olympian on August 13, 2019. [15] Demigods and Monsters [ edit ] Connor and Travis Stoll – The sons of Hermes and friends of Percy. Everyone thinks that they are twins but they are not. Many people assume that they are brothers because they are identical. They like to steal things from camp and love pranks. Janus - Roman God of doorways, beginnings, and endings. He bothered Annabeth in the Labyrinth. He is a Roman god. Any scenes with Paul Blofis, Persephone, Bianca di Angelo, Maria di Angelo, Mr. Dare, and Chris Rodriguez. Minzesheimer, Bob (January 18, 2006). " 'Lightning' strikes with young readers". USA Today . Retrieved 2009-05-26.

Luke Castellan - Son of Hermes and the mortal May Castellan. The Hero of the Prophecy. Gives his body as a host for Kronos. Main Antagonist. Dies after stabbing himself in the underarm, his weak spot, on Olympus. his mortal spot to destroy Kronos and save Mount Olympus, dying heroically. The gods reward Percy and his friends and offer him immortality. Percy rejects the offer but instead requests for the gods to claim all their children and to have cabins for all the gods, including the minor ones. Rachel Elizabeth Dare becomes Apollo's next Oracle, breaking Hades' curse on the position, and recites the next Great Prophecy. The book finishes with Percy and Annabeth becoming a couple, and ominous clouds looming over Rachel's next Great Prophecy. The story is continued in sequel series The Heroes of Olympus and The Trials of Apollo. Meat loaf sandwiches are good!" a second voice snarled. "But this is half-blood scent, I swear. They are on board!"

He explains that he was spreading the news about Pan's death and recruiting fighters when he saw a strange man walking through Central Park. Everyone within the immediate vicinity of the strange man would fall asleep, and when he has passed them, they would awake as if nothing had happened. As he went to confront the man, the man put him under a deep sleep. Krios - Titan of stars and constellations. He guarded Mount Othrys. Hermes told Percy that he fled from Mount Othrys when Kronos was scattered, but in reality, he was killed by Jason Grace and the Roman army From Camp Jupiter.Grover Underwood – Percy's best friend, a satyr, and a new member of the Council of Cloven Elders. He is also a kind of ambassador for the power of the god Pan in the world.

Clarisse La Rue – A daughter of Ares, and a rival of Percy's. At first, due to a disagreement with Apollo's cabin at Camp Half-Blood, she and her brethren refuse to fight in the war. Her friend Silena Beauregard's death, in part because of her refusal to fight, changes her mind. After Clarisse defeats the drakon, Thalia suggests that Percy and Annabeth go to Olympus to help set up the final defenses. On their way to the elevator, they see Grover kneeling over a dying Leneus. After Leneus is reincarnated into a laurel, Grover accompanies Percy and Annabeth to plant Leneus in the gardens of Olympus. Many thought that Thalia Grace, the daughter of Zeus, could have been the subject of the great prophecy, but the prophecy states "A single choice shall end his days," so Thalia couldn't have been the hero, as she is female and identifies as a female Dionysus - Dionysus is the god of wine and madness, son of Zeus and Semele. After he dated a nymph that was off limits, he was forced to work at Camp Half-Blood and couldn’t drink wine. He was forced to work at camp for a century. Dionysus is mostly angry and bitter, but secretly cares for and likes the campers, and will even defend them. His wife is Ariadne and he has two children at Camp: Castor and Pollux. Nemean Lion - The Nemean lion is a lion killed by Hercules in one of his twelve labors. He was killed again by Percy, Thalia, Bianca, Grover, and Zoë at the Air and Space Museum. His pelt was given to Percy, who offered it to Poseidon.Luke Castellan HE HURTS MEEE. I was surprised at how much this book broke my heart in regards to Luke. He deserved better but I loved how his story ends and I was so surprised in how invested I ended up in him considering he's the villain throughout the series