Jason Grace

"I'm the son of Jupiter! I'm a child of Rome, consul to demigods, praetor of the First Legion. I slew the Trojan sea monster. I toppled the black throne of Kronos, and destroyed the Titan Krios with my own hands. And now, I'm going to destroy you, Porphyrion, and feed you to your own wolves."

- Jason confronts Porphyrion.

Jason Grace is one of main protagonists of the second Camp Half-Blood series, The Heroes of Olympus. He is a Roman demigod, a son of Zeus, as his Roman counterpart, Jupiter, and full-blood brother to Thalia Grace.

History
Jason is the son of Jupiter and Ms. Grace. His older sister is Thalia, his mother's daughter by Zeus (Jupiter's Greek counterpart) who raised him in the absence of their alchoholic mother. When he was two years old, Jason was turned over to Juno (Hera) who placed him in Lupa's care.

The Lost Hero
Jason wakes up on a bus belonging to the Wilderness School holding hands with a girl he doesn't even know. He finds that he has no memory of even going to the school or having a best friend named Leo and a girlfriend named Piper. Gleeson Hedge, his supposed gym teacher and satyr protector (though Jason doesn't know that yet), tells him that he's never seen him before today and that the Mist has been manipulated to make everyone think that they know him. He also reveals that he, Piper, and Leo are demigods and that an extraction team (Annabeth and Butch) is coming to get Piper and Leo to camp along with an unknown "special package", which turns out to be Jason. This story is confirmed when Jason sees Leo make a working mechanical helicopter out of pipe cleaners. Later, an unnaturally powerful storm arrives and the class bully Dylan revealed himself to be a Ventus, or Venti (storm spirit), Greek form anemoi. Jason instinctively took out his gold coin (ivlivs), flipped it, and it became a well balanced sword made of Imperial Gold. While he and Piper fought off Dylan, Hedge (who revealed himself to be a middle aged satyr) climbed down the canyon wall to retrieve Leo when he was thrown down. Jason also survived a lightning bolt with which Dylan attacked him that could have killed twenty men, (it blew off his shoe though) and when Piper is thrown off the skywalk Jason jumps after her, discovering that he can manipulate air. After a long battle, Dylan takes Hedge away and leaves Leo, Jason, and Piper on the canyon skywalk. Just then two half-bloods arrive on a chariot pulled by pegasi; a guy named Butch, son of Iris (the rainbow goddess), and Annabeth, daughter of Athena. When Annabeth and Butch notice Jason only has one shoe on (as the other one was blasted into bits by the lightning bolt) Butch tells them that Annabeth had a vision that a boy with one shoe would help her find one of the campers, who has been missing for three days, her boyfriend Perceus Jackson

After they arrive at Camp Half-Blood, they find out Hera, goddess of marriage, is in danger, and Jason must lead a quest in order to save her. He chooses Piper, who is now claimed by Aphrodite, the goddess of love, and Leo, who was claimed by Hephaestus when they got to Camp Half-blood, to go with him on his quest.Jason also recieves a Prophecy saying that he must beware the earth, possibly because Gaea, the Earth, is his enemy and that she bears arms to the doors of death. He meets Medea, a mortal who was supposed to have died more than 3000 centuries ago. In the middle of the book, Jason and his companions met another mortal who was supposed to have died millions of years ago, Midas. That's right, Midas, the one who wished for the golden touch, then learned to bring back people from their goldified state, running water.

When he, Piper and Leo arrive back at camp, he is visited by Juno when he is in his cabin alone, and is given a new gladius as a replacement for the one he lost while fighting the giant, Enceladus. After this, a head counselor meeting was called, where he then revealed that he is from a Roman equivalent of Camp Half-Blood, and that is where Percy is most likely at. Jason also reveals that if the campers at the Roman Camp discover that Percy's from Camp-Half Blood, they may not be that nice.

Personality
Even after losing his memory, Jason's foremost characteristic is his loyalty to friends. A serious young man with a moderate sense of humor, Jason is a born hero who hates cruelty and injustice. Though a natural leader, he can be plagued by doubt and criticizes himself whenever he makes an error. Jason has several personality traits that are similar to Percy Jackson's such as: his loyalty to his friends, his natural leadership, and his sense of justice.

Physical Appearance
Jason Grace is described as handsome, having the features of a Roman Statue, with bright blue eyes, tidily cropped blond hair, and a small scar on the corner of his lip from trying to eat a stapler when he was two years old. He is of average height with athletic built, having muscular and tanned arms. He has an intimidating tattoo etched deeply under his forearm: twelve straight lines like a bar code with an eagle (his father's sacred animal) and the letters SPQR (which stands for Senatus Populusque Romanus or The Senate and People of Rome) over the lines, having presumably received them at The Roman Camp Half-Blood.

Abilities
Jason's abilities include:
 * ADHD: Like all demigods, Jason possesses inborn battle reflexes and superhuman senses that he uses to analyze the fighting style of his opponent.
 * Fighting Skills: Jason is an expert spearman and swordsman due to legion training
 * Dyslexia: Jason's brain is hardwired for Latin,

Specific Abilities
Being the son of Zeus/Jupiter; Jason holds command over the creatures of the sky as well as weather, having powers that are greater than the children of nearly every other god.
 * Aerokinetic powers: Jason can control the forces of the atmosphere such as
 * Controlling and resisting electricity.
 * Dominating the will of Venti.
 * Manipulating air currents.

Family
Jupiter

Zeus sired Jason, his second child with Ms. Grace in his Roman aspect. Like all the Roman Gods, Jupiter rarely involves himself in the life of his child. Although it is unlikely that he has ever met his father, Jason is still given his aid when it is most needed.

Ms. Grace

Since Jason has forgotten his memories, we can imply that he wasn't taken care of by his mother since Thalia said that she was the one who took care of him.

Thalia

Jason's sister, Thalia Grace, was born by Zeus. Thalia is a Greek Demi-god, because when Zeus visited her mother the first time, he was in his Greek form. When Zeus came to Jason's mother for the second time, he came in his Roman form, Jupiter. Jason is therefore a Roman demigod, while his sister is Greek. It is shown that Jason cares for his sister. He feels somewhat depressed that Thalia has found a new family in the Hunters of Artemis.

Love Interests
She and Jason share many romantic moments throughout The Lost Hero. He has much concern for her, as he does everything to help her, such as when she says they should get together he says in his thoughts together, yes.He puts his hand on her waist to support her when she collapsed due to hypothermia. At the end of The Lost Hero, she and he have a romantic moment at the end of which they repeat what they said in Piper's Mist induced memory of them kissing.
 * Piper

Jason can't remember that well (since he had his memory erased by Hera), but he is sure that they had a relationship in the Roman Camp. He thinks this is a problem as he likes Piper.
 * Reyna

Magical Items

 * A coin made of Imperial Gold, it turns into a golden sword on heads or a golden javelin on tails when flipped. The weapon hasn't been named yet in the series, but the coin has the word 'Ivlivs' on it, which is Latin for 'Julius.' It was destroyed by Enceladus.
 * A gladius that Hera/Juno gave him after the coin was destroyed towards the end of The Lost Hero.

Trivia

 * Jason was named after the original Jason, a mortal, by Jupiter to please Hera/Juno after being conceived.
 * It is revealed that Jason and Thalia Grace are the only demigod pairs to be full siblings (having the same mortal mother and godly parent) but having the different aspects of the god.
 * They are also the only known siblings to be from different aspects of the same God. Thalia is a Greek demigod (being a daughter of Zeus), and Jason is Roman (being a son of Jupiter), as stated by Hera/Juno herself.
 * Unlike other children of Zeus/Jupiter, Hera doesn't hate him or try to kill him like his other sibilings. Hera said that she was Jason's patron and Jason was her champion.
 * Jason is the only living demigod child of the Big Three that doesn't have dark hair.
 * Jason is the only demigod to survive seeing a god's divine form (Hera).
 * Thalia and Jason are both mentioned to like cheeseburgers.